diff --git a/setup.py b/setup.py
index 24dc9fb2..3b65a18c 100755
--- a/setup.py
+++ b/setup.py
@@ -1,21 +1,27 @@
 #!/usr/bin/env python3
 
+import importlib
+import json
+import os
+
+from setuptools import find_packages, setup
+
+
 PROJ_NAME = 'you-get'
 PACKAGE_NAME = 'you_get'
 
 PROJ_METADATA = '%s.json' % PROJ_NAME
 
-import os, json, imp
 here = os.path.abspath(os.path.dirname(__file__))
 proj_info = json.loads(open(os.path.join(here, PROJ_METADATA), encoding='utf-8').read())
 try:
     README = open(os.path.join(here, 'README.rst'), encoding='utf-8').read()
-except:
+except Exception:
     README = ""
 CHANGELOG = open(os.path.join(here, 'CHANGELOG.rst'), encoding='utf-8').read()
-VERSION = imp.load_source('version', os.path.join(here, 'src/%s/version.py' % PACKAGE_NAME)).__version__
+VERSION = importlib.load_source('version', os.path.join(here, 'src/%s/version.py' % PACKAGE_NAME)).__version__
+
 
-from setuptools import setup, find_packages
 setup(
     name = proj_info['name'],
     version = VERSION,
diff --git a/src/you_get/__main__.py b/src/you_get/__main__.py
index b7ec6f04..3617bbb8 100644
--- a/src/you_get/__main__.py
+++ b/src/you_get/__main__.py
@@ -4,8 +4,9 @@ import getopt
 import os
 import platform
 import sys
-from .version import script_name, __version__
+
 from .util import git, log
+from .version import __version__, script_name
 
 _options = [
     'help',
@@ -60,7 +61,7 @@ def main_dev(**kwargs):
                     log.println("    branch:   {}\n    commit:   {}".format("(stable)", "(tag v{})".format(__version__)))
 
                 log.println("    platform: {}".format(platform.platform()))
-                log.println("    python:   {}".format(sys.version.split('\n')[0]))
+                log.println("    python:   {}".format(sys.version.split('\n', maxsplit=1)[0]))
 
             elif opt in ('-g', '--gui'):
                 # Run using GUI.
diff --git a/src/you_get/common.py b/src/you_get/common.py
index c5c19d01..188b3da2 100755
--- a/src/you_get/common.py
+++ b/src/you_get/common.py
@@ -1,25 +1,26 @@
 #!/usr/bin/env python
 
+import argparse
 import io
-import os
-import re
-import sys
-import time
 import json
-import socket
 import locale
 import logging
-import argparse
+import os
+import re
+import socket
 import ssl
+import sys
+import time
 from http import cookiejar
 from importlib import import_module
-from urllib import request, parse, error
+from urllib import error, parse, request
 
-from .version import __version__
+from . import json_output as json_output_
 from .util import log, term
 from .util.git import get_version
 from .util.strings import get_filename, unescape_html
-from . import json_output as json_output_
+from .version import __version__
+
 sys.stdout = io.TextIOWrapper(sys.stdout.buffer,encoding='utf8')
 
 SITES = {
@@ -195,7 +196,7 @@ def general_m3u8_extractor(url, headers={}):
 def maybe_print(*s):
     try:
         print(*s)
-    except:
+    except Exception:
         pass
 
 
@@ -270,15 +271,15 @@ def matchall(text, patterns):
 
 
 def launch_player(player, urls):
-    import subprocess
     import shlex
+    import subprocess
     urls = list(urls)
     for url in urls.copy():
         if type(url) is list:
             urls.extend(url)
     urls = [url for url in urls if type(url) is str]
     assert urls
-    if (sys.version_info >= (3, 3)):
+    if sys.version_info >= (3, 3):
         import shutil
         exefile=shlex.split(player)[0]
         if shutil.which(exefile) is not None:
@@ -302,7 +303,7 @@ def parse_query_param(url, param):
 
     try:
         return parse.parse_qs(parse.urlparse(url).query)[param][0]
-    except:
+    except Exception:
         return None
 
 
@@ -326,8 +327,8 @@ def escape_file_path(path):
 def ungzip(data):
     """Decompresses data for Content-Encoding: gzip.
     """
-    from io import BytesIO
     import gzip
+    from io import BytesIO
     buffer = BytesIO(data)
     f = gzip.GzipFile(fileobj=buffer)
     return f.read()
@@ -629,7 +630,7 @@ def url_info(url, faker=False, headers={}):
                     ext = filename.split('.')[-1]
                 else:
                     ext = None
-            except:
+            except Exception:
                 ext = None
         else:
             ext = None
@@ -711,7 +712,7 @@ def url_save(
                     if not force and auto_rename:
                         path, ext = os.path.basename(filepath).rsplit('.', 1)
                         finder = re.compile(' \([1-9]\d*?\)$')
-                        if (finder.search(path) is None):
+                        if finder.search(path) is None:
                             thisfile = path + ' (1).' + ext
                         else:
                             def numreturn(a):
@@ -781,7 +782,7 @@ def url_save(
                     response.headers['content-range'][6:].split('/')[1]
                 )
                 range_length = end_length - range_start
-            except:
+            except Exception:
                 content_length = response.headers['content-length']
                 range_length = int(content_length) if content_length is not None \
                     else float('inf')
@@ -855,8 +856,7 @@ class SimpleProgressBar:
         self.displayed = True
         bar_size = self.bar_size
         percent = round(self.received * 100 / self.total_size, 1)
-        if percent >= 100:
-            percent = 100
+        percent = min(percent, 100)
         dots = bar_size * int(percent) // 100
         plus = int(percent) - dots // bar_size * 100
         if plus > 0.8:
@@ -992,7 +992,7 @@ def download_urls(
         print_user_agent(faker=faker)
         try:
             print('Real URLs:\n%s' % '\n'.join(urls))
-        except:
+        except Exception:
             print('Real URLs:\n%s' % '\n'.join([j for i in urls for j in i]))
         return
 
@@ -1003,7 +1003,7 @@ def download_urls(
     if not total_size:
         try:
             total_size = urls_size(urls, faker=faker, headers=headers)
-        except:
+        except Exception:
             import traceback
             traceback.print_exc(file=sys.stdout)
             pass
@@ -1077,7 +1077,7 @@ def download_urls(
                     from .processor.join_flv import concat_flv
                     concat_flv(parts, output_filepath)
                 print('Merged into %s' % output_filename)
-            except:
+            except Exception:
                 raise
             else:
                 for part in parts:
@@ -1093,7 +1093,7 @@ def download_urls(
                     from .processor.join_mp4 import concat_mp4
                     concat_mp4(parts, output_filepath)
                 print('Merged into %s' % output_filename)
-            except:
+            except Exception:
                 raise
             else:
                 for part in parts:
@@ -1109,7 +1109,7 @@ def download_urls(
                     from .processor.join_ts import concat_ts
                     concat_ts(parts, output_filepath)
                 print('Merged into %s' % output_filename)
-            except:
+            except Exception:
                 raise
             else:
                 for part in parts:
@@ -1123,7 +1123,7 @@ def download_urls(
                 from .processor.ffmpeg import ffmpeg_concat_mp3_to_mp3
                 ffmpeg_concat_mp3_to_mp3(parts, output_filepath)
                 print('Merged into %s' % output_filename)
-            except:
+            except Exception:
                 raise
             else:
                 for part in parts:
@@ -1152,9 +1152,8 @@ def download_rtmp_url(
         play_rtmpdump_stream(player, url, params)
         return
 
-    from .processor.rtmpdump import (
-        has_rtmpdump_installed, download_rtmpdump_stream
-    )
+    from .processor.rtmpdump import (download_rtmpdump_stream,
+                                     has_rtmpdump_installed)
     assert has_rtmpdump_installed(), 'RTMPDump not installed.'
     download_rtmpdump_stream(url,  title, ext, params, output_dir)
 
@@ -1175,7 +1174,7 @@ def download_url_ffmpeg(
         launch_player(player, [url])
         return
 
-    from .processor.ffmpeg import has_ffmpeg_installed, ffmpeg_download_stream
+    from .processor.ffmpeg import ffmpeg_download_stream, has_ffmpeg_installed
     assert has_ffmpeg_installed(), 'FFmpeg not installed.'
 
     global output_filename
@@ -1397,7 +1396,8 @@ def load_cookies(cookiefile):
         with open(cookiefile, 'r', encoding='utf-8') as f:
             for line in f:
                 # last field may be absent, so keep any trailing tab
-                if line.endswith("\n"): line = line[:-1]
+                if line.endswith("\n"):
+                    line = line[:-1]
 
                 # skip comments and blank lines XXX what is $ for?
                 if (line.strip().startswith(("#", "$")) or
@@ -1443,7 +1443,9 @@ def load_cookies(cookiefile):
                 cookies.set_cookie(c)
 
     elif cookiefile.endswith(('.sqlite', '.sqlite3')):
-        import sqlite3, shutil, tempfile
+        import shutil
+        import sqlite3
+        import tempfile
         temp_dir = tempfile.gettempdir()
         temp_cookiefile = os.path.join(temp_dir, 'temp_cookiefile.sqlite')
         shutil.copy2(cookiefile, temp_cookiefile)
@@ -1486,12 +1488,12 @@ def set_socks_proxy(proxy):
                 socks_proxy_auth[1]
             )
         else:
-           socks_proxy_addrs = proxy.split(':')
-           socks.set_default_proxy(
-               socks.SOCKS5,
-               socks_proxy_addrs[0],
-               int(socks_proxy_addrs[1]),
-           )
+            socks_proxy_addrs = proxy.split(':')
+            socks.set_default_proxy(
+                socks.SOCKS5,
+                socks_proxy_addrs[0],
+                int(socks_proxy_addrs[1]),
+            )
         socket.socket = socks.socksocket
 
         def getaddrinfo(*args):
@@ -1812,7 +1814,7 @@ def google_search(url):
         r'(https://www\.youtube\.com/watch\?v=[\w-]+)', page
     )
     print('Best matched result:')
-    return(videos[0])
+    return videos[0]
 
 
 def url_to_module(url):
@@ -1844,7 +1846,7 @@ def url_to_module(url):
     else:
         try:
             location = get_location(url) # t.co isn't happy with fake_headers
-        except:
+        except Exception:
             location = get_location(url, headers=fake_headers)
 
         if location and location != url and not location.startswith('/'):
diff --git a/src/you_get/extractor.py b/src/you_get/extractor.py
index bd71717e..b7afefda 100644
--- a/src/you_get/extractor.py
+++ b/src/you_get/extractor.py
@@ -1,12 +1,16 @@
 #!/usr/bin/env python
 
-from .common import match1, maybe_print, download_urls, get_filename, parse_host, set_proxy, unset_proxy, get_content, dry_run, player
-from .common import print_more_compatible as print
-from .util import log
-from . import json_output
 import os
 import sys
 
+from . import json_output
+from .common import (download_urls, dry_run, get_content, get_filename, match1,
+                     maybe_print, parse_host, player)
+from .common import print_more_compatible as print
+from .common import set_proxy, unset_proxy
+from .util import log
+
+
 class Extractor():
     def __init__(self, *args):
         self.url = None
@@ -53,7 +57,7 @@ class VideoExtractor():
 
         try:
             self.streams_sorted = [dict([('id', stream_type['id'])] + list(self.streams[stream_type['id']].items())) for stream_type in self.__class__.stream_types if stream_type['id'] in self.streams]
-        except:
+        except Exception:
             self.streams_sorted = [dict([('itag', stream_type['itag'])] + list(self.streams[stream_type['itag']].items())) for stream_type in self.__class__.stream_types if stream_type['itag'] in self.streams]
 
         self.extract(**kwargs)
@@ -72,7 +76,7 @@ class VideoExtractor():
 
         try:
             self.streams_sorted = [dict([('id', stream_type['id'])] + list(self.streams[stream_type['id']].items())) for stream_type in self.__class__.stream_types if stream_type['id'] in self.streams]
-        except:
+        except Exception:
             self.streams_sorted = [dict([('itag', stream_type['itag'])] + list(self.streams[stream_type['itag']].items())) for stream_type in self.__class__.stream_types if stream_type['itag'] in self.streams]
 
         self.extract(**kwargs)
diff --git a/src/you_get/extractors/__init__.py b/src/you_get/extractors/__init__.py
index 8c43a8bc..e1967a53 100755
--- a/src/you_get/extractors/__init__.py
+++ b/src/you_get/extractors/__init__.py
@@ -33,9 +33,9 @@ from .interest import *
 from .iqilu import *
 from .iqiyi import *
 from .joy import *
+from .kakao import *
 from .khan import *
 from .ku6 import *
-from .kakao import *
 from .kuaishou import *
 from .kugou import *
 from .kuwo import *
diff --git a/src/you_get/extractors/acfun.py b/src/you_get/extractors/acfun.py
index cd275927..fdb3d704 100644
--- a/src/you_get/extractors/acfun.py
+++ b/src/you_get/extractors/acfun.py
@@ -3,6 +3,7 @@
 from ..common import *
 from ..extractor import VideoExtractor
 
+
 class AcFun(VideoExtractor):
     name = "AcFun"
 
@@ -15,7 +16,7 @@ class AcFun(VideoExtractor):
         {'id': '720P', 'qualityType': '720p'},
         {'id': '540P', 'qualityType': '540p'},
         {'id': '360P', 'qualityType': '360p'}
-    ]    
+    ]
 
     def prepare(self, **kwargs):
         assert re.match(r'https?://[^\.]*\.*acfun\.[^\.]+/(\D|bangumi)/\D\D(\d+)', self.url)
@@ -43,7 +44,7 @@ class AcFun(VideoExtractor):
             currentVideoInfo = json_data.get('currentVideoInfo')
 
         else:
-            raise NotImplemented            
+            raise NotImplemented
 
         if 'ksPlayJson' in currentVideoInfo:
             durationMillis = currentVideoInfo['durationMillis']
@@ -58,7 +59,7 @@ class AcFun(VideoExtractor):
             container = 'mp4'
             stream_id = stream["qualityLabel"]
             quality = stream["qualityType"]
-            
+
             stream_data = dict(src=m3u8_url, size=size, container=container, quality=quality)
             self.streams[stream_id] = stream_data
 
@@ -68,7 +69,7 @@ class AcFun(VideoExtractor):
         p_title = r1('active">([^<]+)', html)
         self.title = '%s (%s)' % (self.title, up)
         if p_title:
-            self.title = '%s - %s' % (self.title, p_title)       
+            self.title = '%s - %s' % (self.title, p_title)
 
 
     def download(self, **kwargs):
@@ -119,7 +120,7 @@ class AcFun(VideoExtractor):
             if self.referer is not None:
                 headers['Referer'] = self.referer
 
-            download_url_ffmpeg(url, self.title, ext, output_dir=kwargs['output_dir'], merge=kwargs['merge'])                           
+            download_url_ffmpeg(url, self.title, ext, output_dir=kwargs['output_dir'], merge=kwargs['merge'])
 
             if 'caption' not in kwargs or not kwargs['caption']:
                 print('Skipping captions or danmaku.')
diff --git a/src/you_get/extractors/alive.py b/src/you_get/extractors/alive.py
index 5d6e2b2a..d39248b3 100644
--- a/src/you_get/extractors/alive.py
+++ b/src/you_get/extractors/alive.py
@@ -4,14 +4,15 @@ __all__ = ['alive_download']
 
 from ..common import *
 
+
 def alive_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     html = get_html(url)
-    
+
     title = r1(r'<meta property="og:title" content="([^"]+)"', html)
-    
+
     url = r1(r'file: "(http://alive[^"]+)"', html)
     type, ext, size = url_info(url)
-    
+
     print_info(site_info, title, type, size)
     if not info_only:
         download_urls([url], title, ext, size, output_dir, merge = merge)
diff --git a/src/you_get/extractors/archive.py b/src/you_get/extractors/archive.py
index 0cefb021..13825926 100644
--- a/src/you_get/extractors/archive.py
+++ b/src/you_get/extractors/archive.py
@@ -4,6 +4,7 @@ __all__ = ['archive_download']
 
 from ..common import *
 
+
 def archive_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_html(url)
     title = r1(r'<meta property="og:title" content="([^"]*)"', html)
diff --git a/src/you_get/extractors/baidu.py b/src/you_get/extractors/baidu.py
index 521d5e99..9b745f26 100644
--- a/src/you_get/extractors/baidu.py
+++ b/src/you_get/extractors/baidu.py
@@ -67,7 +67,7 @@ def baidu_download_song(sid, output_dir='.', merge=True, info_only=False):
         print_info(site_info, title, type, size)
         if not info_only:
             download_urls([lrc], file_name, ext, size, output_dir, faker=True)
-    except:
+    except Exception:
         pass
 
 
@@ -124,7 +124,7 @@ def baidu_download(url, output_dir='.', stream_type=None, merge=True, info_only=
         try:
             # embedded videos
             embed_download(url, output_dir, merge=merge, info_only=info_only, **kwargs)
-        except:
+        except Exception:
             # images
             html = get_html(url)
             title = r1(r'title:"([^"]+)"', html)
@@ -185,17 +185,17 @@ def baidu_pan_download(url):
     isprotected = False
     sign, timestamp, bdstoken, appid, primary_id, fs_id, uk = baidu_pan_parse(
         html)
-    if sign == None:
+    if sign is None:
         if re.findall(r'\baccess-code\b', html):
             isprotected = True
             sign, timestamp, bdstoken, appid, primary_id, fs_id, uk, fake_headers, psk = baidu_pan_protected_share(
                 url)
             # raise NotImplementedError("Password required!")
-        if isprotected != True:
+        if isprotected is False:
             raise AssertionError("Share not found or canceled: %s" % url)
-    if bdstoken == None:
+    if bdstoken is None:
         bdstoken = ""
-    if isprotected != True:
+    if isprotected is False:
         sign, timestamp, bdstoken, appid, primary_id, fs_id, uk = baidu_pan_parse(
             html)
     request_url = "http://pan.baidu.com/api/sharedownload?sign=%s&timestamp=%s&bdstoken=%s&channel=chunlei&clienttype=0&web=1&app_id=%s" % (
@@ -208,7 +208,7 @@ def baidu_pan_download(url):
         'primaryid': primary_id,
         'fid_list': '[' + fs_id + ']'
     }
-    if isprotected == True:
+    if isprotected is True:
         post_data['sekey'] = psk
     response_content = post_content(request_url, fake_headers, post_data, True)
     errno = match1(response_content, errno_patt)
@@ -249,7 +249,7 @@ def baidu_pan_gen_cookies(url, post_data=None):
     cookiejar = cookiejar.CookieJar()
     opener = request.build_opener(request.HTTPCookieProcessor(cookiejar))
     resp = opener.open('http://pan.baidu.com')
-    if post_data != None:
+    if post_data is not None:
         resp = opener.open(url, bytes(parse.urlencode(post_data), 'utf-8'))
     return cookjar2hdr(cookiejar)
 
@@ -264,8 +264,8 @@ def baidu_pan_protected_share(url):
         'vcode': None,
         'vstr': None
     }
-    from http import cookiejar
     import time
+    from http import cookiejar
     cookiejar = cookiejar.CookieJar()
     opener = request.build_opener(request.HTTPCookieProcessor(cookiejar))
     resp = opener.open('http://pan.baidu.com')
diff --git a/src/you_get/extractors/bandcamp.py b/src/you_get/extractors/bandcamp.py
index c24e4f3d..5b06a031 100644
--- a/src/you_get/extractors/bandcamp.py
+++ b/src/you_get/extractors/bandcamp.py
@@ -4,6 +4,7 @@ __all__ = ['bandcamp_download']
 
 from ..common import *
 
+
 def bandcamp_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_html(url)
     trackinfo = json.loads(r1(r'(\[{"(video_poster_url|video_caption)".*}\]),', html))
diff --git a/src/you_get/extractors/baomihua.py b/src/you_get/extractors/baomihua.py
index 9e97879a..aca71dbc 100644
--- a/src/you_get/extractors/baomihua.py
+++ b/src/you_get/extractors/baomihua.py
@@ -2,20 +2,21 @@
 
 __all__ = ['baomihua_download', 'baomihua_download_by_id']
 
-from ..common import *
-
 import urllib
 
+from ..common import *
+
+
 def baomihua_headers(referer=None, cookie=None):
-	# a reasonable UA
-	ua = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36'
-	headers = {'Accept': '*/*', 'Accept-Language': 'en-US,en;q=0.5', 'User-Agent': ua}
-	if referer is not None:
-		headers.update({'Referer': referer})
-	if cookie is not None:
-		headers.update({'Cookie': cookie})
-	return headers
-	
+    # a reasonable UA
+    ua = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36'
+    headers = {'Accept': '*/*', 'Accept-Language': 'en-US,en;q=0.5', 'User-Agent': ua}
+    if referer is not None:
+        headers.update({'Referer': referer})
+    if cookie is not None:
+        headers.update({'Cookie': cookie})
+    return headers
+
 def baomihua_download_by_id(id, title=None, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_html('http://play.baomihua.com/getvideourl.aspx?flvid=%s&devicetype=phone_app' % id)
     host = r1(r'host=([^&]*)', html)
diff --git a/src/you_get/extractors/bigthink.py b/src/you_get/extractors/bigthink.py
index 1dd196d5..01cd3e51 100644
--- a/src/you_get/extractors/bigthink.py
+++ b/src/you_get/extractors/bigthink.py
@@ -1,9 +1,10 @@
 #!/usr/bin/env python
 
+import json
+
 from ..common import *
 from ..extractor import VideoExtractor
 
-import json
 
 class Bigthink(VideoExtractor):
     name = "Bigthink"
@@ -15,19 +16,19 @@ class Bigthink(VideoExtractor):
         # {'id': '288'},
         # {'id': '190'},
         # {'id': '180'},
-        
+
     ]
 
     @staticmethod
     def get_streams_by_id(account_number, video_id):
         """
         int, int->list
-        
+
         Get the height of the videos.
-        
+
         Since brightcove is using 3 kinds of links: rtmp, http and https,
         we will be using the HTTPS one to make it secure.
-        
+
         If somehow akamaihd.net is blocked by the Great Fucking Wall,
         change the "startswith https" to http.
         """
@@ -57,7 +58,7 @@ class Bigthink(VideoExtractor):
         account_number = match1(html, r'data-account="(\d+)"')
 
         video_id = match1(html, r'data-brightcove-id="(\d+)"')
-        
+
         assert account_number, video_id
 
         link_list = self.get_streams_by_id(account_number, video_id)
diff --git a/src/you_get/extractors/bilibili.py b/src/you_get/extractors/bilibili.py
index 6d34c2c4..54b1f52b 100644
--- a/src/you_get/extractors/bilibili.py
+++ b/src/you_get/extractors/bilibili.py
@@ -1,11 +1,13 @@
 #!/usr/bin/env python
 
-from ..common import *
-from ..extractor import VideoExtractor
+import sys
 
 import hashlib
 import math
 
+from ..common import *
+from ..extractor import VideoExtractor
+
 
 class Bilibili(VideoExtractor):
     name = "Bilibili"
@@ -115,7 +117,7 @@ class Bilibili(VideoExtractor):
     @staticmethod
     def bilibili_space_channel_api(mid, cid, pn=1, ps=100):
         return 'https://api.bilibili.com/x/space/channel/video?mid=%s&cid=%s&pn=%s&ps=%s&order=0&jsonp=jsonp' % (mid, cid, pn, ps)
-   
+
     @staticmethod
     def bilibili_space_collection_api(mid, cid, pn=1, ps=30):
         return 'https://api.bilibili.com/x/polymer/space/seasons_archives_list?mid=%s&season_id=%s&sort_reverse=false&page_num=%s&page_size=%s' % (mid, cid, pn, ps)
@@ -123,7 +125,7 @@ class Bilibili(VideoExtractor):
     @staticmethod
     def bilibili_series_archives_api(mid, sid, pn=1, ps=100):
         return 'https://api.bilibili.com/x/series/archives?mid=%s&series_id=%s&pn=%s&ps=%s&only_normal=true&sort=asc&jsonp=jsonp' % (mid, sid, pn, ps)
-    
+
     @staticmethod
     def bilibili_space_favlist_api(fid, pn=1, ps=20):
         return 'https://api.bilibili.com/x/v3/fav/resource/list?media_id=%s&pn=%s&ps=%s&order=mtime&type=0&tid=0&jsonp=jsonp' % (fid, pn, ps)
@@ -144,7 +146,7 @@ class Bilibili(VideoExtractor):
     def url_size(url, faker=False, headers={},err_value=0):
         try:
             return url_size(url,faker,headers)
-        except:
+        except Exception:
             return err_value
 
     def prepare(self, **kwargs):
@@ -154,7 +156,7 @@ class Bilibili(VideoExtractor):
 
         try:
             html_content = get_content(self.url, headers=self.bilibili_headers(referer=self.url))
-        except:
+        except Exception:
             html_content = ''  # live always returns 400 (why?)
         #self.title = match1(html_content,
         #                    r'<h1 title="([^"]+)"')
@@ -607,7 +609,7 @@ class Bilibili(VideoExtractor):
             if stream_id not in self.streams and stream_id not in self.dash_streams:
                 log.e('[Error] Invalid video format.')
                 log.e('Run \'-i\' command with no specific video format to view all available formats.')
-                exit(2)
+                sys.exit(2)
         else:
             # extract stream with the best quality
             stream_id = self.streams_sorted[0]['id']
@@ -642,7 +644,7 @@ class Bilibili(VideoExtractor):
             sort = 'audio_menu'
         else:
             log.e('[Error] Unsupported URL pattern.')
-            exit(1)
+            sys.exit(1)
 
         # regular video
         if sort == 'video':
@@ -654,8 +656,8 @@ class Bilibili(VideoExtractor):
             if pn == len(initial_state['videoData']['pages']):
                 # non-interative video
                 for pi in range(1, pn + 1):
-                     purl = 'https://www.bilibili.com/video/av%s?p=%s' % (aid, pi)
-                     self.__class__().download_by_url(purl, **kwargs)
+                    purl = 'https://www.bilibili.com/video/av%s?p=%s' % (aid, pi)
+                    self.__class__().download_by_url(purl, **kwargs)
 
             else:
                 # interative video
@@ -705,7 +707,7 @@ class Bilibili(VideoExtractor):
                                 self.prepare_by_cid(aid,choice['cid'],initial_state['videoData']['title']+('P{}. {}'.format(len(download_cid_set),choice['option'])),html_content,playinfo,playinfo_,url)
                                 try:
                                     self.streams_sorted = [dict([('id', stream_type['id'])] + list(self.streams[stream_type['id']].items())) for stream_type in self.__class__.stream_types if stream_type['id'] in self.streams]
-                                except:
+                                except Exception:
                                     self.streams_sorted = [dict([('itag', stream_type['itag'])] + list(self.streams[stream_type['itag']].items())) for stream_type in self.__class__.stream_types if stream_type['itag'] in self.streams]
                                 self.extract(**kwargs)
                                 self.download(**kwargs)
diff --git a/src/you_get/extractors/bokecc.py b/src/you_get/extractors/bokecc.py
index 542e83ba..11a17875 100644
--- a/src/you_get/extractors/bokecc.py
+++ b/src/you_get/extractors/bokecc.py
@@ -1,8 +1,10 @@
 #!/usr/bin/env python
 
+import xml.etree.ElementTree as ET
+
 from ..common import *
 from ..extractor import VideoExtractor
-import xml.etree.ElementTree as ET
+
 
 class BokeCC(VideoExtractor):
     name = "BokeCC"
@@ -16,14 +18,14 @@ class BokeCC(VideoExtractor):
 
     def download_by_id(self, vid = '', title = None, output_dir='.', merge=True, info_only=False,**kwargs):
         """self, str->None
-        
+
         Keyword arguments:
         self: self
         vid: The video ID for BokeCC cloud, something like
         FE3BB999594978049C33DC5901307461
-        
+
         Calls the prepare() to download the video.
-        
+
         If no title is provided, this method shall try to find a proper title
         with the information providin within the
         returned content of the API."""
@@ -34,8 +36,8 @@ class BokeCC(VideoExtractor):
 
         self.extract(**kwargs)
 
-        self.download(output_dir = output_dir, 
-                    merge = merge, 
+        self.download(output_dir = output_dir,
+                    merge = merge,
                     info_only = info_only, **kwargs)
 
     def prepare(self, vid = '', title = None, **kwargs):
@@ -49,7 +51,7 @@ class BokeCC(VideoExtractor):
 
         if self.tree.find('result').text != '1':
             log.wtf('API result says failed!')
-            raise 
+            raise
 
         if title is None:
             self.title = '_'.join([i.text for i in self.tree.iterfind('video/videomarks/videomark/markdesc')])
@@ -81,7 +83,7 @@ class BokeCC(VideoExtractor):
             if stream_id not in self.streams:
                 log.e('[Error] Invalid video format.')
                 log.e('Run \'-i\' command with no specific video format to view all available formats.')
-                exit(2)
+                sys.exit(2)
         else:
             # Extract stream with the best quality
             stream_id = self.streams_sorted[0]['id']
diff --git a/src/you_get/extractors/cbs.py b/src/you_get/extractors/cbs.py
index 342eb249..d8658db5 100644
--- a/src/you_get/extractors/cbs.py
+++ b/src/you_get/extractors/cbs.py
@@ -3,9 +3,9 @@
 __all__ = ['cbs_download']
 
 from ..common import *
-
 from .theplatform import theplatform_download_by_pid
 
+
 def cbs_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     """Downloads CBS videos by URL.
     """
diff --git a/src/you_get/extractors/ckplayer.py b/src/you_get/extractors/ckplayer.py
index 5ff1f7b1..81b3bef9 100644
--- a/src/you_get/extractors/ckplayer.py
+++ b/src/you_get/extractors/ckplayer.py
@@ -6,9 +6,12 @@
 
 __all__ = ['ckplayer_download']
 
-from xml.etree import ElementTree as ET
 from copy import copy
+from xml.etree import ElementTree as ET
+
 from ..common import *
+
+
 #----------------------------------------------------------------------
 def ckplayer_get_info_by_xml(ckinfo):
     """str->dict
@@ -57,23 +60,23 @@ def dictify(r,root=True):
 def ckplayer_download_by_xml(ckinfo, output_dir = '.', merge = False, info_only = False, **kwargs):
     #Info XML
     video_info = ckplayer_get_info_by_xml(ckinfo)
-    
+
     try:
         title = kwargs['title']
-    except:
+    except Exception:
         title = ''
     type_ = ''
     size = 0
-    
+
     if len(video_info['links']) > 0:  #has link
         type_, _ext, size = url_info(video_info['links'][0])  #use 1st to determine type, ext
-    
+
     if 'size' in video_info:
         size = int(video_info['size'])
     else:
         for i in video_info['links'][1:]:  #save 1st one
             size += url_info(i)[2]
-    
+
     print_info(site_info, title, type_, size)
     if not info_only:
         download_urls(video_info['links'], title, _ext, size, output_dir=output_dir, merge=merge)
@@ -83,15 +86,15 @@ def ckplayer_download(url, output_dir = '.', merge = False, info_only = False, i
     if is_xml:  #URL is XML URL
         try:
             title = kwargs['title']
-        except:
+        except Exception:
             title = ''
         try:
             headers = kwargs['headers']  #headers provided
             ckinfo = get_content(url, headers = headers)
         except NameError:
             ckinfo = get_content(url)
-        
-        ckplayer_download_by_xml(ckinfo, output_dir, merge, 
+
+        ckplayer_download_by_xml(ckinfo, output_dir, merge,
                                 info_only, title = title)
 
 site_info = "CKPlayer General"
diff --git a/src/you_get/extractors/cntv.py b/src/you_get/extractors/cntv.py
index a56cde6f..9744fab9 100644
--- a/src/you_get/extractors/cntv.py
+++ b/src/you_get/extractors/cntv.py
@@ -3,7 +3,7 @@
 import json
 import re
 
-from ..common import get_content, r1, match1, playlist_not_supported
+from ..common import get_content, match1, playlist_not_supported, r1
 from ..extractor import VideoExtractor
 
 __all__ = ['cntv_download', 'cntv_download_by_id']
@@ -50,7 +50,7 @@ def cntv_download(url, **kwargs):
          re.match(r'http://\w+.cntv.cn/(\w+/)*VIDE\d+.shtml', url) or \
          re.match(r'http://(\w+).cntv.cn/(\w+)/classpage/video/(\d+)/(\d+).shtml', url) or \
          re.match(r'http(s)?://\w+.cctv.com/\d+/\d+/\d+/\w+.shtml', url) or \
-         re.match(r'http://\w+.cntv.cn/\d+/\d+/\d+/\w+.shtml', url): 
+         re.match(r'http://\w+.cntv.cn/\d+/\d+/\d+/\w+.shtml', url):
         page = get_content(url)
         rid = r1(r'videoCenterId","(\w+)"', page)
         if rid is None:
diff --git a/src/you_get/extractors/dailymotion.py b/src/you_get/extractors/dailymotion.py
index 789dff45..7ad3cc9c 100644
--- a/src/you_get/extractors/dailymotion.py
+++ b/src/you_get/extractors/dailymotion.py
@@ -2,9 +2,11 @@
 
 __all__ = ['dailymotion_download']
 
-from ..common import *
 import urllib.parse
 
+from ..common import *
+
+
 def rebuilt_url(url):
     path = urllib.parse.urlparse(url).path
     aid = path.split('/')[-1].split('_')[0]
diff --git a/src/you_get/extractors/douban.py b/src/you_get/extractors/douban.py
index 1a4a67d1..804d6358 100644
--- a/src/you_get/extractors/douban.py
+++ b/src/you_get/extractors/douban.py
@@ -2,9 +2,12 @@
 
 __all__ = ['douban_download']
 
-import urllib.request, urllib.parse
+import urllib.parse
+import urllib.request
+
 from ..common import *
 
+
 def douban_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     html = get_html(url)
 
@@ -37,13 +40,13 @@ def douban_download(url, output_dir = '.', merge = True, info_only = False, **kw
                 real_url = resp_data['r']
                 type, ext, size = url_info(real_url)
                 print_info(site_info, title, type, size)
-            except:
+            except Exception:
                 pass
 
             if not info_only:
                 try:
                     download_urls([real_url], title, ext, size, output_dir, merge = merge)
-                except:
+                except Exception:
                     pass
 
     else:
diff --git a/src/you_get/extractors/douyin.py b/src/you_get/extractors/douyin.py
index 4b60de3c..8b4ce65d 100644
--- a/src/you_get/extractors/douyin.py
+++ b/src/you_get/extractors/douyin.py
@@ -2,16 +2,8 @@
 
 import json
 
-from ..common import (
-    url_size,
-    print_info,
-    get_content,
-    fake_headers,
-    download_urls,
-    playlist_not_supported,
-    match1,
-    get_location,
-)
+from ..common import (download_urls, fake_headers, get_content, get_location,
+                      match1, playlist_not_supported, print_info, url_size)
 
 __all__ = ['douyin_download_by_url']
 
@@ -32,7 +24,7 @@ def get_value(source: dict, path):
                 else:
                     value = None
                     break
-    except:
+    except Exception:
         value = None
     return value
 
diff --git a/src/you_get/extractors/douyutv.py b/src/you_get/extractors/douyutv.py
index 82ea5c4d..3f24573d 100644
--- a/src/you_get/extractors/douyutv.py
+++ b/src/you_get/extractors/douyutv.py
@@ -2,12 +2,13 @@
 
 __all__ = ['douyutv_download']
 
+import hashlib
+import json
+import re
+import time
+
 from ..common import *
 from ..util.log import *
-import json
-import hashlib
-import time
-import re
 
 headers = {
         'user-agent': 'Mozilla/5.0 (iPad; CPU OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B466 Safari/600.1.4'
diff --git a/src/you_get/extractors/ehow.py b/src/you_get/extractors/ehow.py
index e28527ff..77321c8b 100644
--- a/src/you_get/extractors/ehow.py
+++ b/src/you_get/extractors/ehow.py
@@ -4,34 +4,39 @@ __all__ = ['ehow_download']
 
 from ..common import *
 
-def ehow_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
-	
-	assert re.search(r'http://www.ehow.com/video_', url), "URL you entered is not supported"
 
-	html = get_html(url)
-	contentid = r1(r'<meta name="contentid" scheme="DMINSTR2" content="([^"]+)" />', html)
-	vid = r1(r'"demand_ehow_videoid":"([^"]+)"', html)
-	assert vid
+def ehow_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
 
-	xml = get_html('http://www.ehow.com/services/video/series.xml?demand_ehow_videoid=%s' % vid)
-    
-	from xml.dom.minidom import parseString
-	doc = parseString(xml)
-	tab = doc.getElementsByTagName('related')[0].firstChild
+    assert re.search(r'http://www.ehow.com/video_',
+                     url), "URL you entered is not supported"
 
-	for video in tab.childNodes:
-		if re.search(contentid, video.attributes['link'].value):
-			url = video.attributes['flv'].value
-			break
+    html = get_html(url)
+    contentid = r1(
+        r'<meta name="contentid" scheme="DMINSTR2" content="([^"]+)" />', html)
+    vid = r1(r'"demand_ehow_videoid":"([^"]+)"', html)
+    assert vid
 
-	title = video.attributes['title'].value
-	assert title 
+    xml = get_html(
+        'http://www.ehow.com/services/video/series.xml?demand_ehow_videoid=%s' % vid)
+
+    from xml.dom.minidom import parseString
+    doc = parseString(xml)
+    tab = doc.getElementsByTagName('related')[0].firstChild
+
+    for video in tab.childNodes:
+        if re.search(contentid, video.attributes['link'].value):
+            url = video.attributes['flv'].value
+            break
+
+    title = video.attributes['title'].value
+    assert title
+
+    type, ext, size = url_info(url)
+    print_info(site_info, title, type, size)
+
+    if not info_only:
+        download_urls([url], title, ext, size, output_dir, merge=merge)
 
-	type, ext, size = url_info(url)
-	print_info(site_info, title, type, size)
-	
-	if not info_only:
-		download_urls([url], title, ext, size, output_dir, merge = merge)
 
 site_info = "ehow.com"
 download = ehow_download
diff --git a/src/you_get/extractors/embed.py b/src/you_get/extractors/embed.py
index aedf5137..8527754a 100644
--- a/src/you_get/extractors/embed.py
+++ b/src/you_get/extractors/embed.py
@@ -3,7 +3,7 @@ __all__ = ['embed_download']
 import urllib.parse
 
 from ..common import *
-
+from . import bokecc, iqiyi
 from .bilibili import bilibili_download
 from .dailymotion import dailymotion_download
 from .iqiyi import iqiyi_download_by_vid
@@ -14,8 +14,6 @@ from .sina import sina_download_by_vid
 from .tudou import tudou_download_by_id
 from .vimeo import vimeo_download_by_id
 from .youku import youku_download_by_vid
-from . import iqiyi
-from . import bokecc
 
 """
 refer to http://open.youku.com/tools
diff --git a/src/you_get/extractors/facebook.py b/src/you_get/extractors/facebook.py
index ba8aea8c..e0a2e5e8 100644
--- a/src/you_get/extractors/facebook.py
+++ b/src/you_get/extractors/facebook.py
@@ -2,9 +2,11 @@
 
 __all__ = ['facebook_download']
 
-from ..common import *
 import json
 
+from ..common import *
+
+
 def facebook_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     url = re.sub(r'//.*?facebook.com','//facebook.com',url)
     html = get_html(url)
@@ -12,7 +14,7 @@ def facebook_download(url, output_dir='.', merge=True, info_only=False, **kwargs
     title = r1(r'<title id="pageTitle">(.+)</title>', html)
 
     if title is None:
-      title = url
+        title = url
 
     sd_urls = list(set([
         unicodize(str.replace(i, '\\/', '/'))
diff --git a/src/you_get/extractors/fc2video.py b/src/you_get/extractors/fc2video.py
index d6f522ce..1c77f09b 100644
--- a/src/you_get/extractors/fc2video.py
+++ b/src/you_get/extractors/fc2video.py
@@ -2,10 +2,12 @@
 
 __all__ = ['fc2video_download']
 
-from ..common import *
+import re
 from hashlib import md5
 from urllib.parse import urlparse
-import re
+
+from ..common import *
+
 
 #----------------------------------------------------------------------
 def makeMimi(upid):
diff --git a/src/you_get/extractors/flickr.py b/src/you_get/extractors/flickr.py
index 79fca4ff..9d129cd0 100644
--- a/src/you_get/extractors/flickr.py
+++ b/src/you_get/extractors/flickr.py
@@ -2,10 +2,10 @@
 
 __all__ = ['flickr_download_main']
 
-from ..common import *
-
 import json
 
+from ..common import *
+
 pattern_url_photoset = r'https?://www\.flickr\.com/photos/.+/(?:(?:sets)|(?:albums))?/([^/]+)'
 pattern_url_photostream = r'https?://www\.flickr\.com/photos/([^/]+)(?:/|(?:/page))?$'
 pattern_url_single_photo = r'https?://www\.flickr\.com/photos/[^/]+/(\d+)'
@@ -225,4 +225,4 @@ def get_single_photo_url(url):
 
 site_info = "Flickr.com"
 download = flickr_download_main
-download_playlist = playlist_not_supported('flickr');
+download_playlist = playlist_not_supported('flickr')
diff --git a/src/you_get/extractors/freesound.py b/src/you_get/extractors/freesound.py
index a0fe4eec..3b4514cc 100644
--- a/src/you_get/extractors/freesound.py
+++ b/src/you_get/extractors/freesound.py
@@ -4,14 +4,15 @@ __all__ = ['freesound_download']
 
 from ..common import *
 
+
 def freesound_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     page = get_html(url)
-    
+
     title = r1(r'<meta property="og:title" content="([^"]*)"', page)
     preview_url = r1(r'<meta property="og:audio" content="([^"]*)"', page)
-    
+
     type, ext, size = url_info(preview_url)
-    
+
     print_info(site_info, title, type, size)
     if not info_only:
         download_urls([preview_url], title, ext, size, output_dir, merge = merge)
diff --git a/src/you_get/extractors/funshion.py b/src/you_get/extractors/funshion.py
index 1f7156b5..8ba845d2 100644
--- a/src/you_get/extractors/funshion.py
+++ b/src/you_get/extractors/funshion.py
@@ -1,14 +1,14 @@
 #!/usr/bin/env python
 
-import json
-import urllib.parse
 import base64
 import binascii
+import json
 import re
+import urllib.parse
 
+from ..common import get_content, playlist_not_supported
 from ..extractors import VideoExtractor
 from ..util import log
-from ..common import get_content, playlist_not_supported
 
 __all__ = ['funshion_download']
 
diff --git a/src/you_get/extractors/giphy.py b/src/you_get/extractors/giphy.py
index 1dd30223..b4201fb7 100644
--- a/src/you_get/extractors/giphy.py
+++ b/src/you_get/extractors/giphy.py
@@ -2,9 +2,11 @@
 
 __all__ = ['giphy_download']
 
-from ..common import *
 import json
 
+from ..common import *
+
+
 def giphy_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_html(url)
 
@@ -16,7 +18,7 @@ def giphy_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     title = r1(r'<meta property="og:title" content="(.*?)">', html)
 
     if title is None:
-      title = url[0]
+        title = url[0]
 
     type, ext, size = url_info(url[0], True)
     size = urls_size(url)
diff --git a/src/you_get/extractors/google.py b/src/you_get/extractors/google.py
index c3de296e..6055da02 100644
--- a/src/you_get/extractors/google.py
+++ b/src/you_get/extractors/google.py
@@ -2,10 +2,10 @@
 
 __all__ = ['google_download']
 
-from ..common import *
-
 import re
 
+from ..common import *
+
 # YouTube media encoding options, in descending quality order.
 # taken from http://en.wikipedia.org/wiki/YouTube#Quality_and_codecs, 3/22/2013.
 youtube_codecs = [
@@ -86,12 +86,14 @@ def google_download(url, output_dir = '.', merge = True, info_only = False, **kw
                 if response.headers['content-disposition']:
                     filename = parse.unquote(r1(r'filename="?(.+)"?', response.headers['content-disposition'])).split('.')
                     title = ''.join(filename[:-1])
-        except: pass
+        except Exception:
+            pass
 
         for (i, real_url) in enumerate(real_urls):
             title_i = "%s[%s]" % (title, i) if len(real_urls) > 1 else title
             type, ext, size = url_info(real_url)
-            if ext is None: ext = 'mp4'
+            if ext is None:
+                ext = 'mp4'
 
             print_info(site_info, title_i, ext, size)
             if not info_only:
diff --git a/src/you_get/extractors/heavymusic.py b/src/you_get/extractors/heavymusic.py
index c4ced08e..c5c757b8 100644
--- a/src/you_get/extractors/heavymusic.py
+++ b/src/you_get/extractors/heavymusic.py
@@ -4,6 +4,7 @@ __all__ = ['heavymusic_download']
 
 from ..common import *
 
+
 def heavymusic_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_html(url)
     tracks = re.findall(r'href="(online2\.php[^"]+)"', html)
diff --git a/src/you_get/extractors/icourses.py b/src/you_get/extractors/icourses.py
index 606e21e6..e262d057 100644
--- a/src/you_get/extractors/icourses.py
+++ b/src/you_get/extractors/icourses.py
@@ -1,15 +1,16 @@
 #!/usr/bin/env python
-from ..common import *
-from urllib import parse, error
-import random
-from time import sleep
+import base64
 import datetime
 import hashlib
-import base64
 import logging
+import random
 import re
+from time import sleep
+from urllib import error, parse
 from xml.dom.minidom import parseString
 
+from ..common import *
+
 __all__ = ['icourses_download', 'icourses_playlist_download']
 
 
@@ -174,7 +175,7 @@ def get_playlist(res_id, course_id):
     return re.findall(patt, req)
 
 
-class ICousesExactor(object):
+class ICousesExactor():
     PLAYER_BASE_VER = '150606-1'
     ENCRYPT_MOD_VER = '151020'
     ENCRYPT_SALT = '3DAPmXsZ4o'  # It took really long time to find this...
diff --git a/src/you_get/extractors/ifeng.py b/src/you_get/extractors/ifeng.py
index 1c66f387..95485f19 100644
--- a/src/you_get/extractors/ifeng.py
+++ b/src/you_get/extractors/ifeng.py
@@ -4,6 +4,7 @@ __all__ = ['ifeng_download', 'ifeng_download_by_id']
 
 from ..common import *
 
+
 def ifeng_download_by_id(id, title = None, output_dir = '.', merge = True, info_only = False):
     assert r1(r'([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})', id), id
     url = 'http://vxml.ifengimg.com/video_info_new/%s/%s/%s.xml' % (id[-2], id[-2:], id)
diff --git a/src/you_get/extractors/imgur.py b/src/you_get/extractors/imgur.py
index d612a30a..f170f027 100644
--- a/src/you_get/extractors/imgur.py
+++ b/src/you_get/extractors/imgur.py
@@ -4,6 +4,7 @@ from ..common import *
 from ..extractor import VideoExtractor
 from .universal import *
 
+
 class Imgur(VideoExtractor):
     name = "Imgur"
 
diff --git a/src/you_get/extractors/infoq.py b/src/you_get/extractors/infoq.py
index cf8b59e0..dd166e4b 100644
--- a/src/you_get/extractors/infoq.py
+++ b/src/you_get/extractors/infoq.py
@@ -1,9 +1,10 @@
 #!/usr/bin/env python
 
+import ssl
+
 from ..common import *
 from ..extractor import VideoExtractor
 
-import ssl
 
 class Infoq(VideoExtractor):
     name = "InfoQ"
@@ -23,10 +24,12 @@ class Infoq(VideoExtractor):
         sck = match1(content, r'InfoQConstants\.sck\s*=\s*\'([^\']+)\'')
 
         mp3 = match1(content, r'name="filename"\s*value="([^"]+\.mp3)"')
-        if mp3: mp3 = 'http://res.infoq.com/downloads/mp3downloads/%s' % mp3
+        if mp3:
+            mp3 = 'http://res.infoq.com/downloads/mp3downloads/%s' % mp3
 
         pdf = match1(content, r'name="filename"\s*value="([^"]+\.pdf)"')
-        if pdf: pdf = 'http://res.infoq.com/downloads/pdfdownloads/%s' % pdf
+        if pdf:
+            pdf = 'http://res.infoq.com/downloads/pdfdownloads/%s' % pdf
 
         # cookie handler
         ssl_context = request.HTTPSHandler(
@@ -40,9 +43,12 @@ class Infoq(VideoExtractor):
         ]
         request.install_opener(opener)
 
-        if s: self.streams['video'] = {'url': s }
-        if mp3: self.streams['audio'] = { 'url': mp3 }
-        if pdf: self.streams['slides'] = { 'url': pdf }
+        if s:
+            self.streams['video'] = {'url': s }
+        if mp3:
+            self.streams['audio'] = { 'url': mp3 }
+        if pdf:
+            self.streams['slides'] = { 'url': pdf }
 
     def extract(self, **kwargs):
         for i in self.streams:
diff --git a/src/you_get/extractors/instagram.py b/src/you_get/extractors/instagram.py
index 604c534c..b55fab2c 100755
--- a/src/you_get/extractors/instagram.py
+++ b/src/you_get/extractors/instagram.py
@@ -4,6 +4,7 @@ __all__ = ['instagram_download']
 
 from ..common import *
 
+
 def instagram_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     url = r1(r'([^?]*)', url)
     cont = get_content(url, headers=fake_headers)
@@ -19,7 +20,7 @@ def instagram_download(url, output_dir='.', merge=True, info_only=False, **kwarg
     api_url = 'https://i.instagram.com/api/v1/media/%s/info/' % media_id
     try:
         api_cont = get_content(api_url, headers={**fake_headers, **{'x-ig-app-id': appId}})
-    except:
+    except Exception:
         log.wtf('[Error] Please specify a cookie file.')
     post = json.loads(api_cont)
 
diff --git a/src/you_get/extractors/interest.py b/src/you_get/extractors/interest.py
index 9f47e75c..8dbe8803 100644
--- a/src/you_get/extractors/interest.py
+++ b/src/you_get/extractors/interest.py
@@ -1,8 +1,10 @@
 #!/usr/bin/env python
 
-from ..common import *
 from json import loads
 
+from ..common import *
+
+
 def interest_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     #http://ch.interest.me/zhtv/VOD/View/114789
     #http://program.interest.me/zhtv/sonja/8/Vod/View/15794
@@ -16,7 +18,7 @@ def interest_download(url, output_dir='.', merge=True, info_only=False, **kwargs
         serverurl = play_info['data']['cdn']['serverurl']
     except KeyError:
         raise ValueError('Cannot_Get_Play_URL')
-    except:
+    except Exception:
         raise ValueError('Cannot_Get_Play_URL')
     # I cannot find any example of "fileurl", so i just put it like this for now
     assert serverurl
diff --git a/src/you_get/extractors/iqilu.py b/src/you_get/extractors/iqilu.py
index b6d47e24..290dc375 100644
--- a/src/you_get/extractors/iqilu.py
+++ b/src/you_get/extractors/iqilu.py
@@ -2,20 +2,22 @@
 
 __all__ = ['iqilu_download']
 
-from ..common import *
 import json
 
+from ..common import *
+
+
 def iqilu_download(url, output_dir = '.', merge = False, info_only = False, **kwargs):
     ''''''
     if re.match(r'http://v.iqilu.com/\w+', url):
         patt = r'url\s*:\s*\[([^\]]+)\]'
-        
+
         #URL in webpage
         html = get_content(url)
         player_data = '[' + match1(html, patt) + ']'
         urls = json.loads(player_data)
         url = urls[0]['stream_url']
-        
+
         #grab title
         title = match1(html, r'<meta name="description" content="(.*?)\"\W')
 
diff --git a/src/you_get/extractors/iqiyi.py b/src/you_get/extractors/iqiyi.py
index 16bf45d3..1df36d0c 100644
--- a/src/you_get/extractors/iqiyi.py
+++ b/src/you_get/extractors/iqiyi.py
@@ -1,18 +1,18 @@
 #!/usr/bin/env python
 
+import hashlib
+import json
+import time
+from math import floor
+from random import randint, random
+from uuid import uuid4
+from zlib import decompress
+
+from .. import json_output
 from ..common import *
 from ..common import print_more_compatible as print
 from ..extractor import VideoExtractor
 from ..util import log
-from .. import json_output
-
-from uuid import uuid4
-from random import random,randint
-import json
-from math import floor
-from zlib import decompress
-import hashlib
-import time
 
 '''
 Changelog:
@@ -209,7 +209,7 @@ class Iqiyi(VideoExtractor):
             urls = general_m3u8_extractor(urls[0])
             # ffmpeg fail to convert the output video with mkv extension, due to sort of timestamp problem
             download_urls(urls, self.title, 'mp4', 0, **kwargs)
-            
+
             if not kwargs['caption']:
                 print('Skipping captions.')
                 return
@@ -240,7 +240,7 @@ class Iqiyi(VideoExtractor):
         try:
             if info["data"]['vp']["tkl"]=='' :
                 raise ValueError
-        except:
+        except Exception:
             log.e("[Error] Do not support for iQIYI VIP video.")
             exit(-1)
 
diff --git a/src/you_get/extractors/iwara.py b/src/you_get/extractors/iwara.py
index 37cd712a..5645f8fb 100644
--- a/src/you_get/extractors/iwara.py
+++ b/src/you_get/extractors/iwara.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 __all__ = ['iwara_download']
 from ..common import *
+
 headers = {
     'DNT': '1',
     'Accept-Encoding': 'gzip, deflate, sdch, br',
@@ -29,7 +30,7 @@ def iwara_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     data = json.loads(content)
     if len(data)<1 :
         print('Maybe is Private Video?'+'['+title+']')
-        return True;
+        return True
     down_urls = 'https:' + data[0]['uri']
     type, ext, size = url_info(down_urls, headers=headers)
     print_info(site_info, title+data[0]['resolution'], type, size)
@@ -41,7 +42,7 @@ def download_playlist_by_url( url, **kwargs):
     video_page = get_html(url)
     url_first=match1(url, r"(http[s]?://[^/]+)")
     videos = set(re.findall(r'<a href="(/videos/[^"]+)"', video_page))
-    if(len(videos)>0):
+    if len(videos)>0:
         for video in videos:
             iwara_download(url_first+video, **kwargs)
     else:
diff --git a/src/you_get/extractors/ixigua.py b/src/you_get/extractors/ixigua.py
index f2fd953e..e7a8ab99 100644
--- a/src/you_get/extractors/ixigua.py
+++ b/src/you_get/extractors/ixigua.py
@@ -1,15 +1,14 @@
 #!/usr/bin/env python
 import base64
-
 import binascii
-
-from ..common import *
+import ctypes
 import random
 import string
-import ctypes
 from json import loads
 from urllib import request
 
+from ..common import *
+
 __all__ = ['ixigua_download', 'ixigua_download_playlist_by_url']
 
 headers = {
diff --git a/src/you_get/extractors/joy.py b/src/you_get/extractors/joy.py
index be37cd50..f031400e 100644
--- a/src/you_get/extractors/joy.py
+++ b/src/you_get/extractors/joy.py
@@ -4,6 +4,7 @@ __all__ = ['joy_download']
 
 from ..common import *
 
+
 def video_info(channel_id, program_id, volumn_id):
     url = 'http://msx.app.joy.cn/service.php'
     if program_id:
@@ -14,28 +15,28 @@ def video_info(channel_id, program_id, volumn_id):
     else:
         url += '?action=msxv6'
         url += '&videoid=%s' % volumn_id
-    
+
     xml = get_html(url)
-    
+
     name = r1(r'<Title>(?:<!\[CDATA\[)?(.+?)(?:\]\]>)?</Title>', xml)
     urls = re.findall(r'<Url[^>]*>(?:<!\[CDATA\[)?(.*?)(?:\]\]>)?</Url>', xml)
     hostpath = r1(r'<HostPath[^>]*>(?:<!\[CDATA\[)?(.+?)(?:\]\]>)?</HostPath>', xml)
-    
+
     return name, urls, hostpath
 
 def joy_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     channel_id = r1(r'[^_]channelId\s*:\s*"([^\"]+)"', get_html(url))
     program_id = r1(r'[^_]programId\s*:\s*"([^\"]+)"', get_html(url))
     volumn_id = r1(r'[^_]videoId\s*:\s*"([^\"]+)"', get_html(url))
-    
+
     title, urls, hostpath = video_info(channel_id, program_id, volumn_id)
     urls = [hostpath + url for url in urls]
-    
+
     size = 0
     for url in urls:
         _, ext, temp = url_info(url)
         size += temp
-    
+
     print_info(site_info, title, ext, size)
     if not info_only:
         download_urls(urls, title, ext, size, output_dir = output_dir, merge = merge)
diff --git a/src/you_get/extractors/kakao.py b/src/you_get/extractors/kakao.py
index 4ec282e3..78cfc62f 100644
--- a/src/you_get/extractors/kakao.py
+++ b/src/you_get/extractors/kakao.py
@@ -41,7 +41,7 @@ def kakao_download(url, output_dir='.', info_only=False,  **kwargs):
         print_info(site_info, title, 'mp4', size)
         if not info_only:
             download_urls([video_url], title, 'mp4', size, output_dir, **kwargs)
-    except:
+    except Exception:
         universal_download(url, output_dir, merge=kwargs['merge'], info_only=info_only, **kwargs)
 
 
diff --git a/src/you_get/extractors/khan.py b/src/you_get/extractors/khan.py
index e37c8c58..b67895df 100644
--- a/src/you_get/extractors/khan.py
+++ b/src/you_get/extractors/khan.py
@@ -5,6 +5,7 @@ __all__ = ['khan_download']
 from ..common import *
 from .youtube import YouTube
 
+
 def khan_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_content(url)
     youtube_url = re.search('<meta property="og:video" content="([^"]+)', html).group(1)
diff --git a/src/you_get/extractors/ku6.py b/src/you_get/extractors/ku6.py
index c827eafd..1778959c 100644
--- a/src/you_get/extractors/ku6.py
+++ b/src/you_get/extractors/ku6.py
@@ -2,11 +2,12 @@
 
 __all__ = ['ku6_download', 'ku6_download_by_id']
 
-from ..common import *
-
 import json
 import re
 
+from ..common import *
+
+
 def ku6_download_by_id(id, title = None, output_dir = '.', merge = True, info_only = False):
     data = json.loads(get_html('http://v.ku6.com/fetchVideo4Player/%s...html' % id))['data']
     t = data['t']
@@ -21,7 +22,7 @@ def ku6_download_by_id(id, title = None, output_dir = '.', merge = True, info_on
     for url in urls:
         _, _, temp = url_info(url)
         size += temp
-    
+
     print_info(site_info, title, ext, size)
     if not info_only:
         download_urls(urls, title, ext, size, output_dir, merge = merge)
diff --git a/src/you_get/extractors/kuaishou.py b/src/you_get/extractors/kuaishou.py
index 917920d1..bad5c614 100644
--- a/src/you_get/extractors/kuaishou.py
+++ b/src/you_get/extractors/kuaishou.py
@@ -1,12 +1,13 @@
 #!/usr/bin/env python
 
-import urllib.request
-import urllib.parse
 import json
 import re
+import urllib.parse
+import urllib.request
 
+from ..common import (download_urls, get_content, playlist_not_supported,
+                      print_info, url_size)
 from ..util import log
-from ..common import get_content, download_urls, print_info, playlist_not_supported, url_size
 
 __all__ = ['kuaishou_download_by_url']
 
@@ -27,7 +28,7 @@ def kuaishou_download_by_url(url, info_only=False, **kwargs):
         print_info(site_info, title, video_format, size)
         if not info_only:
             download_urls([video_url], title, video_format, size, **kwargs)
-    except:# extract image
+    except Exception:# extract image
         og_image_url = re.search(r"<meta\s+property=\"og:image\"\s+content=\"(.+?)\"/>", page).group(1)
         image_url = og_image_url
         title = url.split('/')[-1]
diff --git a/src/you_get/extractors/kugou.py b/src/you_get/extractors/kugou.py
index 192bd809..0511abd3 100644
--- a/src/you_get/extractors/kugou.py
+++ b/src/you_get/extractors/kugou.py
@@ -2,11 +2,12 @@
 
 __all__ = ['kugou_download']
 
-from ..common import *
-from json import loads
-from base64 import b64decode
-import re
 import hashlib
+import re
+from base64 import b64decode
+from json import loads
+
+from ..common import *
 
 
 def kugou_download(url, output_dir=".", merge=True, info_only=False, **kwargs):
@@ -26,7 +27,7 @@ def kugou_download(url, output_dir=".", merge=True, info_only=False, **kwargs):
     else:
         # for the www.kugou.com/
         return kugou_download_playlist(url, output_dir=output_dir, merge=merge, info_only=info_only)
-        # raise NotImplementedError(url)       
+        # raise NotImplementedError(url)
 
 
 def kugou_download_by_hash(url, output_dir='.', merge=True, info_only=False):
@@ -41,7 +42,7 @@ def kugou_download_by_hash(url, output_dir='.', merge=True, info_only=False):
     url = j['data']['play_url']
     title = j['data']['audio_name']
     # some songs cann't play because of copyright protection
-    if (url == ''):
+    if url == '':
         return
     songtype, ext, size = url_info(url)
     print_info(site_info, title, songtype, size)
@@ -75,7 +76,7 @@ def kugou_download_playlist(url, output_dir='.', merge=True, info_only=False, **
         for v in json.loads(res):
             urls.append('http://www.kugou.com/song/#hash=%s&album_id=%s' % (v['hash'], v['album_id']))
 
-    # download the playlist        
+    # download the playlist
     # playlist sample:http://www.kugou.com/yy/special/single/487279.html
     else:
         html = get_html(url)
diff --git a/src/you_get/extractors/kuwo.py b/src/you_get/extractors/kuwo.py
index 54c09235..0764e9b1 100644
--- a/src/you_get/extractors/kuwo.py
+++ b/src/you_get/extractors/kuwo.py
@@ -2,9 +2,11 @@
 
 __all__ = ['kuwo_download']
 
-from ..common import *
 import re
 
+from ..common import *
+
+
 def kuwo_download_by_rid(rid, output_dir = '.', merge = True, info_only = False):
     html=get_content("http://player.kuwo.cn/webmusic/st/getNewMuiseByRid?rid=MUSIC_%s"%rid)
     title=match1(html,r"<name>(.*)</name>")
diff --git a/src/you_get/extractors/le.py b/src/you_get/extractors/le.py
index cd5b7a8a..fe708c9b 100644
--- a/src/you_get/extractors/le.py
+++ b/src/you_get/extractors/le.py
@@ -44,7 +44,7 @@ def decode(data):
         loc4 = [0] * (2 * length)
         for i in range(length):
             loc4[2 * i] = loc2[i] >> 4
-            loc4[2 * i + 1] = loc2[i] & 15;
+            loc4[2 * i + 1] = loc2[i] & 15
         loc6 = loc4[len(loc4) - 11:] + loc4[:len(loc4) - 11]
         loc7 = [0] * length
         for i in range(length):
diff --git a/src/you_get/extractors/lizhi.py b/src/you_get/extractors/lizhi.py
index 4991df31..a06554fc 100644
--- a/src/you_get/extractors/lizhi.py
+++ b/src/you_get/extractors/lizhi.py
@@ -1,10 +1,12 @@
 #!/usr/bin/env python
 
 __all__ = ['lizhi_download']
-import json
 import datetime
+import json
+
 from ..common import *
 
+
 #
 # Worked well but not perfect.
 # TODO: add option --format={sd|hd}
diff --git a/src/you_get/extractors/longzhu.py b/src/you_get/extractors/longzhu.py
index 29b340c5..5e5cc9a7 100644
--- a/src/you_get/extractors/longzhu.py
+++ b/src/you_get/extractors/longzhu.py
@@ -3,15 +3,10 @@
 __all__ = ['longzhu_download']
 
 import json
-from ..common import (
-    get_content,
-    general_m3u8_extractor,
-    match1,
-    print_info,
-    download_urls,
-    playlist_not_supported,
-)
-from ..common import player
+
+from ..common import (download_urls, general_m3u8_extractor, get_content,
+                      match1, player, playlist_not_supported, print_info)
+
 
 def longzhu_download(url, output_dir = '.', merge=True, info_only=False, **kwargs):
     web_domain = url.split('/')[2]
diff --git a/src/you_get/extractors/lrts.py b/src/you_get/extractors/lrts.py
index 94d12a25..755c5b64 100644
--- a/src/you_get/extractors/lrts.py
+++ b/src/you_get/extractors/lrts.py
@@ -3,13 +3,16 @@
 __all__ = ['lrts_download']
 
 import logging
+
 from ..common import *
 from ..util import log, term
 
+
 def lrts_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_html(url)
     args = kwargs.get('args')
-    if not args: args = {}
+    if not args:
+        args = {}
     matched = re.search(r"/book/(\d+)", url)
     if not matched:
         raise AssertionError("not found book number: %s" % url)
@@ -25,14 +28,14 @@ def lrts_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     total_count = int(matched.group(1))
     log.i('%s total: %s' % (book_title, total_count))
     first_page = 0
-    if ('first' in args and args.first!= None):
+    if ('first' in args and args.first is not None):
         first_page = int(args.first)
 
     page_size = 10
-    if ('page_size' in args and args.page_size != None):
+    if ('page_size' in args and args.page_size is not None):
         page_size = int(args.page_size)
     last_page = (total_count // page_size) + 1
-    if ('last' in args and args.last != None):
+    if ('last' in args and args.last is not None):
         last_page = int(args.last)
 
     log.i('page size is %s, page from %s to %s' % (page_size, first_page, last_page))
diff --git a/src/you_get/extractors/magisto.py b/src/you_get/extractors/magisto.py
index b2e8e502..5b9ba2d2 100644
--- a/src/you_get/extractors/magisto.py
+++ b/src/you_get/extractors/magisto.py
@@ -2,12 +2,14 @@
 
 __all__ = ['magisto_download']
 
-from ..common import *
 import json
 
+from ..common import *
+
+
 def magisto_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_html(url)
-    
+
     video_hash = r1(r'video\/([a-zA-Z0-9]+)', url)
     api_url = 'https://www.magisto.com/api/video/{}'.format(video_hash)
     content = get_html(api_url)
diff --git a/src/you_get/extractors/metacafe.py b/src/you_get/extractors/metacafe.py
index cd5a6e0d..accfd45a 100644
--- a/src/you_get/extractors/metacafe.py
+++ b/src/you_get/extractors/metacafe.py
@@ -2,21 +2,23 @@
 
 __all__ = ['metacafe_download']
 
-from ..common import *
 import urllib.error
 from urllib.parse import unquote
 
+from ..common import *
+
+
 def metacafe_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     if re.match(r'http://www.metacafe.com/watch/\w+', url):
         html =get_content(url)
         title = r1(r'<meta property="og:title" content="([^"]*)"', html)
-        
+
         for i in html.split('&'):  #wont bother to use re
             if 'videoURL' in i:
                 url_raw = i[9:]
-        
+
         url = unquote(url_raw)
-        
+
         type, ext, size = url_info(url)
         print_info(site_info, title, type, size)
         if not info_only:
diff --git a/src/you_get/extractors/mgtv.py b/src/you_get/extractors/mgtv.py
index 053212ef..c83e951f 100644
--- a/src/you_get/extractors/mgtv.py
+++ b/src/you_get/extractors/mgtv.py
@@ -1,17 +1,17 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-from ..common import *
-from ..extractor import VideoExtractor
-
-from json import loads
-from urllib.parse import urlsplit
-from os.path import dirname
-import re
-
 import base64
+import sys
+import re
 import time
 import uuid
+from json import loads
+from os.path import dirname
+from urllib.parse import urlsplit
+
+from ..common import *
+from ..extractor import VideoExtractor
 
 
 class MGTV(VideoExtractor):
@@ -151,7 +151,7 @@ class MGTV(VideoExtractor):
             if stream_id not in self.streams:
                 log.e('[Error] Invalid video format.')
                 log.e('Run \'-i\' command with no specific video format to view all available formats.')
-                exit(2)
+                sys.exit(2)
         else:
             # Extract stream with the best quality
             stream_id = self.streams_sorted[0]['id']
diff --git a/src/you_get/extractors/miaopai.py b/src/you_get/extractors/miaopai.py
index 91a301b8..46510e1b 100644
--- a/src/you_get/extractors/miaopai.py
+++ b/src/you_get/extractors/miaopai.py
@@ -2,11 +2,12 @@
 
 __all__ = ['miaopai_download']
 
-import string
 import random
-from ..common import *
+import string
 import urllib.error
 import urllib.parse
+
+from ..common import *
 from ..util import fs
 
 fake_headers_mobile = {
@@ -129,12 +130,12 @@ def miaopai_download_direct(url, output_dir='.', merge=False, info_only=False, *
     mobile_page = get_content(url, headers=fake_headers_mobile)
     try:
         title = re.search(r'([\'"])title\1:\s*([\'"])(.+?)\2,', mobile_page).group(3)
-    except:
+    except Exception:
         title = re.search(r'([\'"])status_title\1:\s*([\'"])(.+?)\2,', mobile_page).group(3)
     title = title.replace('\n', '_')
     try:
         stream_url = re.search(r'([\'"])stream_url\1:\s*([\'"])(.+?)\2,', mobile_page).group(3)
-    except:
+    except Exception:
         page_url = re.search(r'([\'"])page_url\1:\s*([\'"])(.+?)\2,', mobile_page).group(3)
         return miaopai_download_story(page_url, info_only=info_only, output_dir=output_dir, merge=merge, **kwargs)
 
diff --git a/src/you_get/extractors/miomio.py b/src/you_get/extractors/miomio.py
index 33f52395..5f8088fa 100644
--- a/src/you_get/extractors/miomio.py
+++ b/src/you_get/extractors/miomio.py
@@ -2,11 +2,12 @@
 
 __all__ = ['miomio_download']
 
-from ..common import *
+from xml.dom.minidom import parseString
 
+from ..common import *
 from .tudou import tudou_download_by_id
 from .youku import youku_download_by_vid
-from xml.dom.minidom import parseString
+
 
 def miomio_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     html = get_html(url)
diff --git a/src/you_get/extractors/missevan.py b/src/you_get/extractors/missevan.py
index 6d9533ce..60fa7092 100644
--- a/src/you_get/extractors/missevan.py
+++ b/src/you_get/extractors/missevan.py
@@ -23,11 +23,12 @@ SOFTWARE.
 """
 
 import json
+import sys
 import os
 import re
 import urllib.parse
 
-from ..common import get_content, urls_size, log, player, dry_run
+from ..common import dry_run, get_content, log, player, urls_size
 from ..extractor import VideoExtractor
 
 _UA = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 ' \
@@ -38,7 +39,7 @@ class _NoMatchException(Exception):
     pass
 
 
-class _Dispatcher(object):
+class _Dispatcher():
 
     def __init__(self):
         self.entry = []
@@ -220,7 +221,7 @@ class MissEvan(VideoExtractor):
             self.__prepare_dispatcher.dispatch(self.url, self, **kwargs)
         except _NoMatchException:
             log.e('[Error] Unsupported URL pattern.')
-            exit(1)
+            sys.exit(1)
 
     @staticmethod
     def download_covers(title, streams, **kwargs):
@@ -291,7 +292,7 @@ class MissEvan(VideoExtractor):
             self._download_playlist_dispatcher.dispatch(url, self, **kwargs)
         except _NoMatchException:
             log.e('[Error] Unsupported URL pattern with --playlist option.')
-            exit(1)
+            sys.exit(1)
 
     def download_by_url(self, url, **kwargs):
         if not kwargs.get('playlist') and self._download_playlist_dispatcher.test(url):
diff --git a/src/you_get/extractors/mixcloud.py b/src/you_get/extractors/mixcloud.py
index aa5c1bdb..c9b3e6f4 100644
--- a/src/you_get/extractors/mixcloud.py
+++ b/src/you_get/extractors/mixcloud.py
@@ -4,6 +4,7 @@ __all__ = ['mixcloud_download']
 
 from ..common import *
 
+
 def mixcloud_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_html(url, faker=True)
     title = r1(r'<meta property="og:title" content="([^"]*)"', html)
@@ -18,7 +19,8 @@ def mixcloud_download(url, output_dir='.', merge=True, info_only=False, **kwargs
         try:
             mime, ext, size = url_info(url)
             break
-        except: continue
+        except Exception:
+            continue
 
     print_info(site_info, title, ext, size)
     if not info_only:
diff --git a/src/you_get/extractors/mtv81.py b/src/you_get/extractors/mtv81.py
index ef432159..2b5ac0fb 100644
--- a/src/you_get/extractors/mtv81.py
+++ b/src/you_get/extractors/mtv81.py
@@ -2,11 +2,10 @@
 
 __all__ = ['mtv81_download']
 
-from ..common import *
-
+from html.parser import HTMLParser
 from xml.dom.minidom import parseString
 
-from html.parser import HTMLParser
+from ..common import *
 
 
 def mtv81_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
diff --git a/src/you_get/extractors/nanagogo.py b/src/you_get/extractors/nanagogo.py
index 1f1ed820..6917eea6 100644
--- a/src/you_get/extractors/nanagogo.py
+++ b/src/you_get/extractors/nanagogo.py
@@ -5,6 +5,7 @@ __all__ = ['nanagogo_download']
 from ..common import *
 from .universal import *
 
+
 def nanagogo_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     if re.match(r'https?://stat.7gogo.jp', url):
         universal_download(url, output_dir, merge=merge, info_only=info_only)
@@ -24,7 +25,8 @@ def nanagogo_download(url, output_dir='.', merge=True, info_only=False, **kwargs
     for i in info['data']['posts']['post']['body']:
         if 'image' in i:
             image_url = i['image']
-            if image_url[:2] == '//': continue # skip stamp images
+            if image_url[:2] == '//':
+                continue # skip stamp images
             _, ext, size = url_info(image_url)
             items.append({'title': title,
                           'url':   image_url,
@@ -39,7 +41,8 @@ def nanagogo_download(url, output_dir='.', merge=True, info_only=False, **kwargs
                           'size':  size})
 
     size = sum([i['size'] for i in items])
-    if size == 0: return # do not fail the whole process
+    if size == 0:
+        return # do not fail the whole process
     print_info(site_info, title, ext, size)
     if not info_only:
         for i in items:
diff --git a/src/you_get/extractors/naver.py b/src/you_get/extractors/naver.py
index 42a607e4..e0873e17 100644
--- a/src/you_get/extractors/naver.py
+++ b/src/you_get/extractors/naver.py
@@ -1,12 +1,13 @@
 #!/usr/bin/env python
 
-import urllib.request
-import urllib.parse
 import json
 import re
+import urllib.parse
+import urllib.request
 
+from ..common import (download_urls, get_content, playlist_not_supported,
+                      print_info, url_size)
 from ..util import log
-from ..common import get_content, download_urls, print_info, playlist_not_supported, url_size
 from .universal import *
 
 __all__ = ['naver_download_by_url']
@@ -32,7 +33,7 @@ def naver_download_by_url(url, output_dir='.', merge=True, info_only=False, **kw
         print_info(site_info, title, 'mp4', size)
         if not info_only:
             download_urls([video_url], title, 'mp4', size, output_dir, **kwargs)
-    except:
+    except Exception:
         universal_download(url, output_dir, merge=merge, info_only=info_only, **kwargs)
 
 site_info = "naver.com"
diff --git a/src/you_get/extractors/netease.py b/src/you_get/extractors/netease.py
index 48e6dc53..f84691e7 100644
--- a/src/you_get/extractors/netease.py
+++ b/src/you_get/extractors/netease.py
@@ -3,13 +3,15 @@
 
 __all__ = ['netease_download']
 
+import base64
+import hashlib
+import os
+from json import loads
+
 from ..common import *
 from ..common import print_more_compatible as print
 from ..util import fs
-from json import loads
-import hashlib
-import base64
-import os
+
 
 def netease_hymn():
     return """
@@ -43,7 +45,8 @@ def netease_cloud_music_download(url, output_dir='.', merge=True, info_only=Fals
                 assert kwargs['caption']
                 l = loads(get_content("http://music.163.com/api/song/lyric/?id=%s&lv=-1&csrf_token=" % i['id'], headers={"Referer": "http://music.163.com/"}))
                 netease_lyric_download(i, l["lrc"]["lyric"], output_dir=new_dir, info_only=info_only)
-            except: pass
+            except Exception:
+                pass
 
     elif "playlist" in url:
         j = loads(get_content("http://music.163.com/api/playlist/detail?id=%s&csrf_token=" % rid, headers={"Referer": "http://music.163.com/"}))
@@ -54,7 +57,7 @@ def netease_cloud_music_download(url, output_dir='.', merge=True, info_only=Fals
                 os.mkdir(new_dir)
             cover_url = j['result']['coverImgUrl']
             download_urls([cover_url], "cover", "jpg", 0, new_dir)
-        
+
         prefix_width = len(str(len(j['result']['tracks'])))
         for n, i in enumerate(j['result']['tracks']):
             playlist_prefix = '%%.%dd_' % prefix_width % n
@@ -63,7 +66,8 @@ def netease_cloud_music_download(url, output_dir='.', merge=True, info_only=Fals
                 assert kwargs['caption']
                 l = loads(get_content("http://music.163.com/api/song/lyric/?id=%s&lv=-1&csrf_token=" % i['id'], headers={"Referer": "http://music.163.com/"}))
                 netease_lyric_download(i, l["lrc"]["lyric"], output_dir=new_dir, info_only=info_only, playlist_prefix=playlist_prefix)
-            except: pass
+            except Exception:
+                pass
 
     elif "song" in url:
         j = loads(get_content("http://music.163.com/api/song/detail/?id=%s&ids=[%s]&csrf_token=" % (rid, rid), headers={"Referer": "http://music.163.com/"}))
@@ -72,7 +76,8 @@ def netease_cloud_music_download(url, output_dir='.', merge=True, info_only=Fals
             assert kwargs['caption']
             l = loads(get_content("http://music.163.com/api/song/lyric/?id=%s&lv=-1&csrf_token=" % rid, headers={"Referer": "http://music.163.com/"}))
             netease_lyric_download(j["songs"][0], l["lrc"]["lyric"], output_dir=output_dir, info_only=info_only)
-        except: pass
+        except Exception:
+            pass
 
     elif "program" in url:
         j = loads(get_content("http://music.163.com/api/dj/program/detail/?id=%s&ids=[%s]&csrf_token=" % (rid, rid), headers={"Referer": "http://music.163.com/"}))
@@ -93,7 +98,8 @@ def netease_cloud_music_download(url, output_dir='.', merge=True, info_only=Fals
         netease_video_download(j['data'], output_dir=output_dir, info_only=info_only)
 
 def netease_lyric_download(song, lyric, output_dir='.', info_only=False, playlist_prefix=""):
-    if info_only: return
+    if info_only:
+        return
 
     title = "%s%s. %s" % (playlist_prefix, song['position'], song['name'])
     filename = '%s.lrc' % get_filename(title)
diff --git a/src/you_get/extractors/nicovideo.py b/src/you_get/extractors/nicovideo.py
index da9129de..5e22d290 100644
--- a/src/you_get/extractors/nicovideo.py
+++ b/src/you_get/extractors/nicovideo.py
@@ -4,6 +4,7 @@ __all__ = ['nicovideo_download']
 
 from ..common import *
 
+
 def nicovideo_login(user, password):
     data = "current_form=login&mail=" + user +"&password=" + password + "&login_submit=Log+In"
     response = request.urlopen(request.Request("https://secure.nicovideo.jp/secure/login?site=niconico", headers=fake_headers, data=data.encode('utf-8')))
@@ -17,10 +18,11 @@ context=ssl.SSLContext(ssl.PROTOCOL_TLSv1))
     opener = request.build_opener(ssl_context, cookie_handler)
     request.install_opener(opener)
 
-    import netrc, getpass
+    import getpass
+    import netrc
     try:
         info = netrc.netrc().authenticators('nicovideo')
-    except:
+    except Exception:
         info = None
     if info is None:
         user = input("User:     ")
diff --git a/src/you_get/extractors/pinterest.py b/src/you_get/extractors/pinterest.py
index 31deb663..49f93b01 100644
--- a/src/you_get/extractors/pinterest.py
+++ b/src/you_get/extractors/pinterest.py
@@ -3,6 +3,7 @@
 from ..common import *
 from ..extractor import VideoExtractor
 
+
 class Pinterest(VideoExtractor):
     # site name
     name = "Pinterest"
@@ -29,8 +30,10 @@ class Pinterest(VideoExtractor):
                           r'<meta property="twitter:image:src" name="twitter:image:src" content="([^"]+)"')
 
         # construct available streams
-        if orig_img: self.streams['original'] = {'url': orig_img}
-        if twit_img: self.streams['small'] = {'url': twit_img}
+        if orig_img:
+            self.streams['original'] = {'url': orig_img}
+        if twit_img:
+            self.streams['small'] = {'url': twit_img}
 
     def extract(self, **kwargs):
         for i in self.streams:
diff --git a/src/you_get/extractors/pixnet.py b/src/you_get/extractors/pixnet.py
index b5c94b24..8a548886 100644
--- a/src/you_get/extractors/pixnet.py
+++ b/src/you_get/extractors/pixnet.py
@@ -2,27 +2,29 @@
 
 __all__ = ['pixnet_download']
 
-from ..common import *
 import urllib.error
+from json import loads
 from time import time
 from urllib.parse import quote
-from json import loads
+
+from ..common import *
+
 
 def pixnet_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     if re.match(r'http://(\w)+.pixnet.net/album/video/(\d)+', url):
         # http://eric6513.pixnet.net/album/video/206644535
         html = get_content(url)
         title = ''.join(r1(r'<meta property="og:description\" content="([^"]*)"', html).split('-')[1:]).strip()
-        
+
         time_now = int(time())
-        
+
         m = re.match(r'http://(\w+).pixnet.net/album/video/(\d+)', url)
-        
+
         username = m.group(1)
         # eric6513
         id = m.group(2)
         # 206644535
-        
+
         data_dict = {'username': username, 'autoplay': 1, 'id': id, 'loop': 0, 'profile': 9, 'time': time_now}
         data_dict_str= quote(str(data_dict).replace("'", '"'), safe='"')  #have to be like this
         url2 = 'http://api.pixnet.tv/content?type=json&customData=' + data_dict_str
@@ -30,21 +32,21 @@ def pixnet_download(url, output_dir = '.', merge = True, info_only = False, **kw
         # if required, can be obtained from url like
         # http://s.ext.pixnet.tv/user/eric6513/html5/autoplay/206644507.js
         # http://api.pixnet.tv/content?type=json&customData={%22username%22:%22eric6513%22,%22id%22:%22206644535%22,%22time%22:1441823350,%22autoplay%22:0,%22loop%22:0,%22profile%22:7}
-        
+
         video_json = get_content(url2)
         content = loads(video_json)
         url_main = content['element']['video_url']
         url_backup = content['element']['backup_video_uri']
         # {"element":{"video_url":"http:\/\/cdn-akamai.node1.cache.pixnet.tv\/user\/eric6513\/13541121820567_6.mp4","backup_video_uri":"http:\/\/fet-1.node1.cache.pixnet.tv\/user\/eric6513\/13541121820567_6.mp4","thumb_url":"\/\/imageproxy.pimg.tw\/zoomcrop?width=480&height=360&url=http%3A%2F%2Fpimg.pixnet.tv%2Fuser%2Feric6513%2F206644507%2Fbg_000000%2F480x360%2Fdefault.jpg%3Fv%3D1422870050","profiles":{"360p":"http:\/\/cdn-akamai.node1.cache.pixnet.tv\/user\/eric6513\/13541121820567.flv","480p":"http:\/\/cdn-akamai.node1.cache.pixnet.tv\/user\/eric6513\/13541121820567_2.mp4","720p":"http:\/\/cdn-akamai.node1.cache.pixnet.tv\/user\/eric6513\/13541121820567_3.mp4"},"backup_profiles":{"360p":"http:\/\/fet-1.node1.cache.pixnet.tv\/user\/eric6513\/13541121820567.flv","480p":"http:\/\/fet-1.node1.cache.pixnet.tv\/user\/eric6513\/13541121820567_2.mp4","720p":"http:\/\/fet-1.node1.cache.pixnet.tv\/user\/eric6513\/13541121820567_3.mp4"},"count_play_url":["http:\/\/api.v6.pixnet.tv\/count?username=eric6513&amp;file=13541121820567.flv&amp;t=1441819681&amp;type=v6play&amp;sig=3350496782","http:\/\/api.pixnet.tv\/count?username=eric6513&amp;file=13541121820567.flv&amp;t=1441819681&amp;type=play&amp;sig=930187858","http:\/\/api.pixnet.tv\/count?username=eric6513&amp;file=13541121820567.flv&amp;t=1441819681&amp;type=html5play&amp;sig=4191197761"],"count_finish_url":["http:\/\/api.pixnet.tv\/count?username=eric6513&amp;file=13541121820567.flv&amp;t=1441819715&amp;type=finish&amp;sig=638797202","http:\/\/api.pixnet.tv\/count?username=eric6513&amp;file=13541121820567.flv&amp;t=1441819715&amp;type=html5finish&amp;sig=3215728991"]}}
-        
+
         try:
             # In some rare cases the main URL is IPv6 only...
             # Something like #611
             url_info(url_main)
             url = url_main
-        except:
+        except Exception:
             url = url_backup
-        
+
         type, ext, size = url_info(url)
         print_info(site_info, title, type, size)
         if not info_only:
diff --git a/src/you_get/extractors/pptv.py b/src/you_get/extractors/pptv.py
index ef25ac44..65fca5bc 100644
--- a/src/you_get/extractors/pptv.py
+++ b/src/you_get/extractors/pptv.py
@@ -2,16 +2,16 @@
 
 #__all__ = ['pptv_download', 'pptv_download_by_id']
 
-from ..common import *
-from ..extractor import VideoExtractor
-
+import binascii
+import random
 import re
 import time
 import urllib
-import random
-import binascii
 from xml.dom.minidom import parseString
 
+from ..common import *
+from ..extractor import VideoExtractor
+
 
 def lshift(a, b):
     return (a << b) & 0xffffffff
@@ -196,7 +196,7 @@ class PPTV(VideoExtractor):
         self.vid = match1(self.url, r'https?://sports.pptv.com/vod/(\d+)/*')
         if self.url and not self.vid:
             if not re.match(r'https?://v.pptv.com/show/(\w+)\.html', self.url):
-                raise('Unknown url pattern')
+                raise 'Unknown url pattern'
             page_content = get_content(self.url, headers)
 
             self.vid = match1(page_content, r'webcfg\s*=\s*{"id":\s*(\d+)')
@@ -206,7 +206,7 @@ class PPTV(VideoExtractor):
                 self.vid = match1(response.url, r'https?://sports.pptv.com/vod/(\d+)/*')
 
         if not self.vid:
-            raise('Cannot find id')
+            raise 'Cannot find id'
         api_url = 'http://web-play.pptv.com/webplay3-0-{}.xml'.format(self.vid)
         api_url += '?type=web.fpp&param=type=web.fpp&version=4'
         dom = parseString(get_content(api_url, headers))
diff --git a/src/you_get/extractors/qie.py b/src/you_get/extractors/qie.py
index 08d462bf..433915b1 100644
--- a/src/you_get/extractors/qie.py
+++ b/src/you_get/extractors/qie.py
@@ -1,11 +1,13 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+import sys
+from json import loads
+
 from ..common import *
 from ..extractor import VideoExtractor
 from ..util.log import *
 
-from json import loads
 
 class QiE(VideoExtractor):
     name = "QiE （企鹅直播）"
@@ -16,9 +18,9 @@ class QiE(VideoExtractor):
         {'id': 'middle', 'container': 'flv', 'video_profile': '550'},
         {'id': 'middle2', 'container': 'flv', 'video_profile': '900'},
     ]
-    
+
     id_dic = {i['video_profile']:(i['id']) for i in stream_types}
-    
+
     api_endpoint = 'http://www.qie.tv/api/v1/room/{room_id}'
     game_ep = 'http://live.qq.com/game/game_details/get_game_details_info/'
 
@@ -53,7 +55,7 @@ class QiE(VideoExtractor):
     def prepare(self, **kwargs):
         if self.url:
             self.vid = self.get_vid_from_url(self.url)
-        
+
         content = get_content(self.api_endpoint.format(room_id = self.vid))
         content = loads(content)
         self.title = content['data']['room_name']
@@ -64,7 +66,7 @@ class QiE(VideoExtractor):
         if len(content['data']['rtmp_multi_bitrate']) > 0:
             for k , v in content['data']['rtmp_multi_bitrate'].items():
                 stream_available[k] = rtmp_url + '/' + v
-        
+
         for s in self.stream_types:
             if s['id'] in stream_available.keys():
                 quality_id = s['id']
@@ -87,7 +89,7 @@ class QiE(VideoExtractor):
             if stream_id not in self.streams:
                 log.e('[Error] Invalid video format.')
                 log.e('Run \'-i\' command with no specific video format to view all available formats.')
-                exit(2)
+                sys.exit(2)
         else:
             # Extract stream with the best quality
             stream_id = self.streams_sorted[0]['id']
diff --git a/src/you_get/extractors/qie_video.py b/src/you_get/extractors/qie_video.py
index 9cf6ef10..6280b8d1 100644
--- a/src/you_get/extractors/qie_video.py
+++ b/src/you_get/extractors/qie_video.py
@@ -1,9 +1,10 @@
+import json
+import math
+
 from ..common import *
 from ..extractor import VideoExtractor
 from ..util.log import *
 
-import json
-import math
 
 class QieVideo(VideoExtractor):
     name = 'QiE Video'
@@ -71,7 +72,7 @@ def general_m3u8_extractor(url):
                     result.append(trimmed)
                 else:
                     result.append(base_url + '/' + trimmed)
-    return result, dur 
-    
+    return result, dur
+
 site = QieVideo()
 download_by_url = site.download_by_url
diff --git a/src/you_get/extractors/qq.py b/src/you_get/extractors/qq.py
index e38770e9..fab4a133 100644
--- a/src/you_get/extractors/qq.py
+++ b/src/you_get/extractors/qq.py
@@ -2,9 +2,9 @@
 
 __all__ = ['qq_download']
 
+from ..common import *
 from .qie import download as qieDownload
 from .qie_video import download_by_url as qie_video_download
-from ..common import *
 
 headers = {
     'user-agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)  QQLive/10275340/50192209 Chrome/43.0.2357.134 Safari/537.36 QBCore/3.43.561.202 QQBrowser/9.0.2524.400'
diff --git a/src/you_get/extractors/qq_egame.py b/src/you_get/extractors/qq_egame.py
index c8dca6e0..f25a5faf 100644
--- a/src/you_get/extractors/qq_egame.py
+++ b/src/you_get/extractors/qq_egame.py
@@ -1,5 +1,5 @@
-import re
 import json
+import re
 
 from ..common import *
 from ..extractors import VideoExtractor
diff --git a/src/you_get/extractors/showroom.py b/src/you_get/extractors/showroom.py
index 606dc806..c49394b1 100644
--- a/src/you_get/extractors/showroom.py
+++ b/src/you_get/extractors/showroom.py
@@ -2,10 +2,12 @@
 
 __all__ = ['showroom_download']
 
-from ..common import *
 import urllib.error
 from json import loads
-from time import time, sleep
+from time import sleep, time
+
+from ..common import *
+
 
 #----------------------------------------------------------------------
 def showroom_get_roomid_by_room_url_key(room_url_key):
diff --git a/src/you_get/extractors/sina.py b/src/you_get/extractors/sina.py
index bb94d8e3..5cbe5089 100644
--- a/src/you_get/extractors/sina.py
+++ b/src/you_get/extractors/sina.py
@@ -2,14 +2,15 @@
 
 __all__ = ['sina_download', 'sina_download_by_vid', 'sina_download_by_vkey']
 
-from ..common import *
-from ..util.log import *
-
+import urllib.parse
 from hashlib import md5
 from random import randint
 from time import time
 from xml.dom.minidom import parseString
-import urllib.parse
+
+from ..common import *
+from ..util.log import *
+
 
 def api_req(vid):
     rand = "0.{0}{1}".format(randint(10000, 10000000), randint(10000, 10000000))
diff --git a/src/you_get/extractors/sohu.py b/src/you_get/extractors/sohu.py
index 74374202..6356d2a9 100644
--- a/src/you_get/extractors/sohu.py
+++ b/src/you_get/extractors/sohu.py
@@ -2,13 +2,13 @@
 
 __all__ = ['sohu_download']
 
-from ..common import *
-
 import json
 import time
 from random import random
 from urllib.parse import urlparse
 
+from ..common import *
+
 '''
 Changelog:
     1. http://tv.sohu.com/upload/swf/20150604/Main.swf
diff --git a/src/you_get/extractors/soundcloud.py b/src/you_get/extractors/soundcloud.py
index 08e9d561..5d873951 100644
--- a/src/you_get/extractors/soundcloud.py
+++ b/src/you_get/extractors/soundcloud.py
@@ -2,11 +2,12 @@
 
 __all__ = ['sndcd_download']
 
-from ..common import *
-import re
 import json
+import re
 import urllib.error
 
+from ..common import *
+
 
 def get_sndcd_apikey():
     home_page = get_content('https://soundcloud.com')
diff --git a/src/you_get/extractors/suntv.py b/src/you_get/extractors/suntv.py
index 0b506440..5502d835 100644
--- a/src/you_get/extractors/suntv.py
+++ b/src/you_get/extractors/suntv.py
@@ -2,17 +2,19 @@
 
 __all__ = ['suntv_download']
 
-from ..common import *
-import urllib
 import re
+import urllib
+
+from ..common import *
+
 
 def suntv_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     if re.match(r'http://www.isuntv.com/\w+', url):
         API_URL = "http://www.isuntv.com/ajaxpro/SunTv.pro_vod_playcatemp4,App_Web_playcatemp4.ascx.9f08f04f.ashx"
-        
+
         itemid = match1(url, r'http://www.isuntv.com/pro/ct(\d+).html')
         values = {"itemid" : itemid, "vodid": ""}
-        
+
         data = str(values).replace("'", '"')
         data = data.encode('utf-8')
         req = urllib.request.Request(API_URL, data)
@@ -20,17 +22,17 @@ def suntv_download(url, output_dir = '.', merge = True, info_only = False, **kwa
         resp = urllib.request.urlopen(req)
         respData = resp.read()
         respData = respData.decode('ascii').strip('"')  #Ahhhhhhh!
-    
+
         video_url = 'http://www.isuntv.com' + str(respData)
-        
+
         html = get_content(url, decoded=False)
         html = html.decode('gbk')
         title = match1(html, '<title>([^<]+)').strip()  #get rid of \r\n s
-        
+
         type_ = ''
         size = 0
         type, ext, size = url_info(video_url)
-        
+
         print_info(site_info, title, type, size)
         if not info_only:
             download_urls([url], title, 'mp4', size, output_dir, merge=merge)
diff --git a/src/you_get/extractors/ted.py b/src/you_get/extractors/ted.py
index c7dd87a1..c4229fe5 100644
--- a/src/you_get/extractors/ted.py
+++ b/src/you_get/extractors/ted.py
@@ -2,9 +2,11 @@
 
 __all__ = ['ted_download']
 
-from ..common import *
 import json
 
+from ..common import *
+
+
 def ted_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_html(url)
     patt = r'"__INITIAL_DATA__"\s*:\s*\{(.+)\}'
diff --git a/src/you_get/extractors/theplatform.py b/src/you_get/extractors/theplatform.py
index c3efb725..bd051dee 100644
--- a/src/you_get/extractors/theplatform.py
+++ b/src/you_get/extractors/theplatform.py
@@ -2,6 +2,7 @@
 
 from ..common import *
 
+
 def theplatform_download_by_pid(pid, title, output_dir='.', merge=True, info_only=False, **kwargs):
     smil_url = "http://link.theplatform.com/s/dJ5BDC/%s/meta.smil?format=smil&mbr=true" % pid
     smil = get_content(smil_url)
diff --git a/src/you_get/extractors/tiktok.py b/src/you_get/extractors/tiktok.py
index b5a6d4bf..49accaf5 100644
--- a/src/you_get/extractors/tiktok.py
+++ b/src/you_get/extractors/tiktok.py
@@ -4,6 +4,7 @@ __all__ = ['tiktok_download']
 
 from ..common import *
 
+
 def tiktok_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     headers = {
         'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0',
diff --git a/src/you_get/extractors/toutiao.py b/src/you_get/extractors/toutiao.py
index 1c356055..0d4cd169 100644
--- a/src/you_get/extractors/toutiao.py
+++ b/src/you_get/extractors/toutiao.py
@@ -33,7 +33,7 @@ def sign_video_url(vid):
                                                                                                     ts=ts)
 
 
-class ToutiaoVideoInfo(object):
+class ToutiaoVideoInfo():
 
     def __init__(self):
         self.bitrate = None
diff --git a/src/you_get/extractors/tucao.py b/src/you_get/extractors/tucao.py
index 66baa3bf..60068d74 100644
--- a/src/you_get/extractors/tucao.py
+++ b/src/you_get/extractors/tucao.py
@@ -1,11 +1,13 @@
 #!/usr/bin/env python
 
 __all__ = ['tucao_download']
-from ..common import *
 # import re
 import random
 import time
 from xml.dom import minidom
+
+from ..common import *
+
 #possible raw list types
 #1. <li>type=tudou&vid=199687639</li>
 #2. <li>type=tudou&vid=199506910|</li>
diff --git a/src/you_get/extractors/tudou.py b/src/you_get/extractors/tudou.py
index b1568dfd..92b0d931 100644
--- a/src/you_get/extractors/tudou.py
+++ b/src/you_get/extractors/tudou.py
@@ -2,10 +2,13 @@
 
 __all__ = ['tudou_download', 'tudou_download_playlist', 'tudou_download_by_id', 'tudou_download_by_iid']
 
-from ..common import *
 from xml.dom.minidom import parseString
+
 import you_get.extractors.acfun
 
+from ..common import *
+
+
 def tudou_download_by_iid(iid, title, output_dir = '.', merge = True, info_only = False):
     data = json.loads(get_decoded_html('http://www.tudou.com/outplay/goto/getItemSegs.action?iid=%s' % iid))
     temp = max([data[i] for i in data if 'size' in data[i][0]], key=lambda x:sum([part['size'] for part in x]))
@@ -84,6 +87,7 @@ def parse_playlist(url):
     assert aid
     assert atitle
     import json
+
     #url = 'http://www.tudou.com/playlist/service/getZyAlbumItems.html?aid='+aid
     url = 'http://www.tudou.com/playlist/service/getAlbumItems.html?aid='+aid
     return [(atitle + '-' + x['title'], str(x['itemId'])) for x in json.loads(get_html(url))['message']]
diff --git a/src/you_get/extractors/tumblr.py b/src/you_get/extractors/tumblr.py
index 1fdfcad0..357df9b6 100644
--- a/src/you_get/extractors/tumblr.py
+++ b/src/you_get/extractors/tumblr.py
@@ -3,11 +3,12 @@
 __all__ = ['tumblr_download']
 
 from ..common import *
-from .universal import *
 from .dailymotion import dailymotion_download
+from .universal import *
 from .vimeo import vimeo_download
 from .vine import vine_download
 
+
 def tumblr_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     if re.match(r'https?://\d+\.media\.tumblr\.com/', url):
         universal_download(url, output_dir, merge=merge, info_only=info_only)
@@ -65,7 +66,7 @@ def tumblr_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
             tumblr_id = r1(r'^tumblr_(.+)_\d+$', title) or title
             try:
                 quality = int(r1(r'^tumblr_.+_(\d+)$', title))
-            except:
+            except Exception:
                 quality = int(r1(r'/s(\d+)x\d+/', hd_url))
             ext = filename.split('.')[-1]
 
@@ -79,7 +80,8 @@ def tumblr_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
                         'ext': ext,
                         'size': size,
                     }
-            except: pass
+            except Exception:
+                pass
 
         if tuggles:
             size = sum([tuggles[t]['size'] for t in tuggles])
@@ -117,7 +119,8 @@ def tumblr_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
             real_url = r1(r'<video[^>]*>[\n ]*<source[^>]+src=[\'"]([^\'"]*)[\'"]', iframe_html)
         else:
             iframe_url = r1(r'<iframe[^>]+src=[\'"]([^\'"]*)[\'"]', html)
-            if iframe_url[:2] == '//': iframe_url = 'http:' + iframe_url
+            if iframe_url[:2] == '//':
+                iframe_url = 'http:' + iframe_url
             if re.search(r'player\.vimeo\.com', iframe_url):
                 vimeo_download(iframe_url, output_dir, merge=merge, info_only=info_only,
                                referer='http://tumblr.com/', **kwargs)
diff --git a/src/you_get/extractors/twitter.py b/src/you_get/extractors/twitter.py
index 7975bdfd..e38396db 100644
--- a/src/you_get/extractors/twitter.py
+++ b/src/you_get/extractors/twitter.py
@@ -6,6 +6,7 @@ from ..common import *
 from .universal import *
 from .vine import vine_download
 
+
 def extract_m3u(source):
     r1 = get_content(source)
     s1 = re.findall(r'(/ext_tw_video/.*)', r1)
@@ -73,7 +74,7 @@ def twitter_download(url, output_dir='.', merge=True, info_only=False, **kwargs)
                 item_id = r1(r'/status/(\d+)', expanded_url)
                 assert False
 
-        elif info['globalObjects']['tweets'][item_id].get('is_quote_status') == True:
+        elif info['globalObjects']['tweets'][item_id].get('is_quote_status') is True:
             # if the tweet does not contain media, but it quotes a tweet
             # and the quoted tweet contains media, download them
             item_id = info['globalObjects']['tweets'][item_id]['quoted_status_id_str']
@@ -93,7 +94,7 @@ def twitter_download(url, output_dir='.', merge=True, info_only=False, **kwargs)
             # no media, no quoted tweet
             return
 
-    except:
+    except Exception:
         authorization = 'Bearer AAAAAAAAAAAAAAAAAAAAAPYXBAAAAAAACLXUNDekMxqa8h%2F40K4moUkGsoc%3DTYfbDKbT3jJPCEVnMYqilB28NHfOPqkca3qaAxGfsyKCs0wRbw'
 
         # FIXME: 403 with cookies
diff --git a/src/you_get/extractors/ucas.py b/src/you_get/extractors/ucas.py
index 4f07bce5..078786de 100644
--- a/src/you_get/extractors/ucas.py
+++ b/src/you_get/extractors/ucas.py
@@ -2,13 +2,14 @@
 
 __all__ = ['ucas_download', 'ucas_download_single', 'ucas_download_playlist']
 
-from ..common import *
-import urllib.error
 import http.client
-from time import time
-from random import random
+import urllib.error
 import xml.etree.ElementTree as ET
 from copy import copy
+from random import random
+from time import time
+
+from ..common import *
 
 """
 Do not replace http.client with get_content
@@ -40,7 +41,7 @@ def _get_video_query_url(resourceID):
         'Connection': 'keep-alive',
     }
     conn = http.client.HTTPConnection("210.76.211.10")
-    
+
     conn.request("GET", "/vplus/remote.do?method=query2&loginname=videocas&pwd=af1c7a4c5f77f790722f7cae474c37e281203765d423a23b&resource=%5B%7B%22resourceID%22%3A%22" + resourceID + "%22%2C%22on%22%3A1%2C%22time%22%3A600%2C%22eid%22%3A100%2C%22w%22%3A800%2C%22h%22%3A600%7D%5D&timeStamp=" + str(int(time())), headers=headers)
     res = conn.getresponse()
     data = res.read()
@@ -51,14 +52,14 @@ def _get_video_query_url(resourceID):
 def _get_virtualPath(video_query_url):
     #getResourceJsCode2
     html = get_content(video_query_url)
-    
+
     return match1(html, r"function\s+getVirtualPath\(\)\s+{\s+return\s+'(\w+)'")
 
 
 def _get_video_list(resourceID):
     """"""
     conn = http.client.HTTPConnection("210.76.211.10")
-        
+
     conn.request("GET", '/vplus/member/resource.do?isyulan=0&method=queryFlashXmlByResourceId&resourceId={resourceID}&randoms={randoms}'.format(resourceID = resourceID,
                                                                                                                                             randoms = random()))
     res = conn.getresponse()
@@ -83,10 +84,10 @@ def _get_video_list(resourceID):
 def _ucas_get_url_lists_by_resourceID(resourceID):
     video_query_url = _get_video_query_url(resourceID)
     assert video_query_url != '', 'Cannot find video GUID!'
-    
+
     virtualPath = _get_virtualPath(video_query_url)
     assert virtualPath != '', 'Cannot find virtualPath!'
-    
+
     url_lists = _get_video_list(resourceID)
     assert url_lists, 'Cannot find any URL to download!'
 
@@ -109,7 +110,7 @@ def ucas_download_single(url, output_dir = '.', merge = False, info_only = False
     title = match1(html, r'<div class="bc-h">(.+)</div>')
     url_lists = _ucas_get_url_lists_by_resourceID(resourceID)
     assert url_lists, 'Cannot find any URL of such class!'
-    
+
     for k, part in enumerate(url_lists):
         part_title = title + '_' + str(k)
         print_info(site_info, part_title, 'flv', 0)
@@ -134,4 +135,4 @@ def ucas_download(url, output_dir = '.', merge = False, info_only = False, **kwa
 
 site_info = "UCAS"
 download = ucas_download
-download_playlist = ucas_download_playlist
\ No newline at end of file
+download_playlist = ucas_download_playlist
diff --git a/src/you_get/extractors/universal.py b/src/you_get/extractors/universal.py
index 4a3268ab..da356015 100644
--- a/src/you_get/extractors/universal.py
+++ b/src/you_get/extractors/universal.py
@@ -5,10 +5,11 @@ __all__ = ['universal_download']
 from ..common import *
 from .embed import *
 
+
 def universal_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     try:
         content_type = get_head(url, headers=fake_headers)['Content-Type']
-    except:
+    except Exception:
         content_type = get_head(url, headers=fake_headers, get_method='GET')['Content-Type']
     if content_type.startswith('text/html'):
         try:
@@ -19,7 +20,8 @@ def universal_download(url, output_dir='.', merge=True, info_only=False, **kwarg
             return
 
     domains = url.split('/')[2].split('.')
-    if len(domains) > 2: domains = domains[1:]
+    if len(domains) > 2:
+        domains = domains[1:]
     site_info = '.'.join(domains)
 
     if content_type.startswith('text/html'):
@@ -43,7 +45,7 @@ def universal_download(url, output_dir='.', merge=True, info_only=False, **kwarg
                                       ext, size,
                                       output_dir=output_dir, merge=merge,
                                       faker=True)
-            except:
+            except Exception:
                 pass
             else:
                 return
@@ -58,7 +60,7 @@ def universal_download(url, output_dir='.', merge=True, info_only=False, **kwarg
                     if not info_only:
                         download_url_ffmpeg(url=hls_url, title=page_title,
                                             ext='mp4', output_dir=output_dir)
-            except:
+            except Exception:
                 pass
             else:
                 return
@@ -142,10 +144,11 @@ def universal_download(url, output_dir='.', merge=True, info_only=False, **kwarg
                 try:
                     mime, ext, size = url_info(candy['url'], faker=False)
                     assert size
-                except:
+                except Exception:
                     mime, ext, size = url_info(candy['url'], faker=True)
-                    if not size: size = float('Inf')
-            except:
+                    if not size:
+                        size = float('Inf')
+            except Exception:
                 continue
             else:
                 print_info(site_info, candy['title'], ext, size)
@@ -154,7 +157,7 @@ def universal_download(url, output_dir='.', merge=True, info_only=False, **kwarg
                         download_urls([candy['url']], candy['title'], ext, size,
                                       output_dir=output_dir, merge=merge,
                                       faker=False)
-                    except:
+                    except Exception:
                         download_urls([candy['url']], candy['title'], ext, size,
                                       output_dir=output_dir, merge=merge,
                                       faker=True)
diff --git a/src/you_get/extractors/veoh.py b/src/you_get/extractors/veoh.py
index eb37c1eb..4e42bc0f 100644
--- a/src/you_get/extractors/veoh.py
+++ b/src/you_get/extractors/veoh.py
@@ -2,9 +2,11 @@
 
 __all__ = ['veoh_download']
 
-from ..common import *
 import urllib.error
 
+from ..common import *
+
+
 def veoh_download(url, output_dir = '.', merge = False, info_only = False, **kwargs):
     '''Get item_id'''
     if re.match(r'http://www.veoh.com/watch/\w+', url):
diff --git a/src/you_get/extractors/vimeo.py b/src/you_get/extractors/vimeo.py
index c7d7b057..efb55e20 100644
--- a/src/you_get/extractors/vimeo.py
+++ b/src/you_get/extractors/vimeo.py
@@ -2,12 +2,13 @@
 
 __all__ = ['vimeo_download', 'vimeo_download_by_id', 'vimeo_download_by_channel', 'vimeo_download_by_channel_id']
 
-from ..common import *
-from ..util.log import *
-from ..extractor import VideoExtractor
-from json import loads
 import urllib.error
 import urllib.parse
+from json import loads
+
+from ..common import *
+from ..extractor import VideoExtractor
+from ..util.log import *
 
 access_token = 'f6785418277b72c7c87d3132c79eec24'  #By Beining
 
@@ -141,7 +142,7 @@ def vimeo_download_by_id(id, title=None, output_dir='.', merge=True, info_only=F
         video_page = get_content(cfg['player']['config_url'], headers=fake_headers)
         title = cfg['clip']['title']
         info = loads(video_page)
-    except:
+    except Exception:
         # embedded player - referer may be required
         if 'referer' in kwargs:
             fake_headers['Referer'] = kwargs['referer']
diff --git a/src/you_get/extractors/vine.py b/src/you_get/extractors/vine.py
index d75454cf..0f38c351 100644
--- a/src/you_get/extractors/vine.py
+++ b/src/you_get/extractors/vine.py
@@ -2,9 +2,10 @@
 
 __all__ = ['vine_download']
 
-from ..common import *
 import json
 
+from ..common import *
+
 
 def vine_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     html = get_content(url)
diff --git a/src/you_get/extractors/w56.py b/src/you_get/extractors/w56.py
index 6b9ff0a1..7aad5dcc 100644
--- a/src/you_get/extractors/w56.py
+++ b/src/you_get/extractors/w56.py
@@ -2,11 +2,11 @@
 
 __all__ = ['w56_download', 'w56_download_by_id']
 
-from ..common import *
+import json
 
+from ..common import *
 from .sohu import sohu_download
 
-import json
 
 def w56_download_by_id(id, title = None, output_dir = '.', merge = True, info_only = False):
     content = json.loads(get_html('http://vxml.56.com/json/%s/?src=site' % id))
diff --git a/src/you_get/extractors/wanmen.py b/src/you_get/extractors/wanmen.py
index 20c543c1..f689e62a 100755
--- a/src/you_get/extractors/wanmen.py
+++ b/src/you_get/extractors/wanmen.py
@@ -2,22 +2,23 @@
 
 __all__ = ['wanmen_download', 'wanmen_download_by_course', 'wanmen_download_by_course_topic', 'wanmen_download_by_course_topic_part']
 
+from json import loads
+
 from ..common import *
 from .bokecc import bokecc_download_by_id
-from json import loads
 
 
 ##Helper functions
 def _wanmen_get_json_api_content_by_courseID(courseID):
     """int->JSON
-    
+
     Return a parsed JSON tree of WanMen's API."""
 
     return loads(get_content('http://api.wanmen.org/course/getCourseNested/{courseID}'.format(courseID = courseID)))
 
 def _wanmen_get_title_by_json_topic_part(json_content, tIndex, pIndex):
     """JSON, int, int, int->str
-    
+
     Get a proper title with courseid+topicID+partID."""
 
     return '_'.join([json_content[0]['name'],
@@ -27,7 +28,7 @@ def _wanmen_get_title_by_json_topic_part(json_content, tIndex, pIndex):
 
 def _wanmen_get_boke_id_by_json_topic_part(json_content, tIndex, pIndex):
     """JSON, int, int, int->str
-    
+
     Get one BokeCC video ID with courseid+topicID+partID."""
 
     return json_content[0]['Topics'][tIndex]['Parts'][pIndex]['ccVideoLink']
@@ -36,7 +37,7 @@ def _wanmen_get_boke_id_by_json_topic_part(json_content, tIndex, pIndex):
 ##Parsers
 def wanmen_download_by_course(json_api_content, output_dir='.', merge=True, info_only=False, **kwargs):
     """int->None
-    
+
     Download a WHOLE course.
     Reuse the API call to save time."""
 
@@ -53,14 +54,14 @@ def wanmen_download_by_course(json_api_content, output_dir='.', merge=True, info
 
 def wanmen_download_by_course_topic(json_api_content, tIndex, output_dir='.', merge=True, info_only=False, **kwargs):
     """int, int->None
-    
+
     Download a TOPIC of a course.
     Reuse the API call to save time."""
 
     for pIndex in range(len(json_api_content[0]['Topics'][tIndex]['Parts'])):
         wanmen_download_by_course_topic_part(json_api_content,
                                              tIndex,
-                                             pIndex, 
+                                             pIndex,
                                             output_dir=output_dir,
                                             merge=merge,
                                             info_only=info_only,
@@ -68,17 +69,17 @@ def wanmen_download_by_course_topic(json_api_content, tIndex, output_dir='.', me
 
 def wanmen_download_by_course_topic_part(json_api_content, tIndex, pIndex, output_dir='.', merge=True, info_only=False, **kwargs):
     """int, int, int->None
-    
+
     Download ONE PART of the course."""
 
     html = json_api_content
 
-    title = _wanmen_get_title_by_json_topic_part(html, 
-                                                  tIndex, 
+    title = _wanmen_get_title_by_json_topic_part(html,
+                                                  tIndex,
                                                   pIndex)
 
     bokeccID = _wanmen_get_boke_id_by_json_topic_part(html,
-                                                      tIndex, 
+                                                      tIndex,
                                                      pIndex)
 
     bokecc_download_by_id(vid = bokeccID, title = title, output_dir=output_dir, merge=merge, info_only=info_only, **kwargs)
@@ -102,22 +103,22 @@ def wanmen_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
 
     if pIndex:  #only download ONE single part
         assert tIndex >= 0
-        wanmen_download_by_course_topic_part(json_api_content, tIndex, pIndex, 
-                                            output_dir = output_dir, 
-                                            merge = merge, 
+        wanmen_download_by_course_topic_part(json_api_content, tIndex, pIndex,
+                                            output_dir = output_dir,
+                                            merge = merge,
                                             info_only = info_only)
     elif tIndex:  #download a topic
-        wanmen_download_by_course_topic(json_api_content, tIndex, 
-                                       output_dir = output_dir, 
-                                       merge = merge, 
+        wanmen_download_by_course_topic(json_api_content, tIndex,
+                                       output_dir = output_dir,
+                                       merge = merge,
                                        info_only = info_only)
     else:  #download the whole course
         wanmen_download_by_course(json_api_content,
-                                 output_dir = output_dir, 
-                                 merge = merge, 
+                                 output_dir = output_dir,
+                                 merge = merge,
                                  info_only = info_only)
 
 
 site_info = "WanMen University"
 download = wanmen_download
-download_playlist = wanmen_download_by_course
\ No newline at end of file
+download_playlist = wanmen_download_by_course
diff --git a/src/you_get/extractors/ximalaya.py b/src/you_get/extractors/ximalaya.py
index 58e2945c..fd25b6f0 100644
--- a/src/you_get/extractors/ximalaya.py
+++ b/src/you_get/extractors/ximalaya.py
@@ -2,11 +2,11 @@
 
 __all__ = ['ximalaya_download_playlist', 'ximalaya_download', 'ximalaya_download_by_id']
 
-from ..common import *
-
 import json
 import re
 
+from ..common import *
+
 stream_types = [
         {'itag': '1', 'container': 'm4a', 'bitrate': 'default'},
         {'itag': '2', 'container': 'm4a', 'bitrate': '32'},
@@ -18,7 +18,7 @@ def ximalaya_download_by_id(id, title = None, output_dir = '.', info_only = Fals
     json_url = BASE_URL + id + '.json'
     json_data = json.loads(get_content(json_url, headers=fake_headers))
     if 'res' in json_data:
-        if json_data['res'] == False:
+        if json_data['res'] is False:
             raise ValueError('Server reported id %s is invalid' % id)
     if 'is_paid' in json_data and json_data['is_paid']:
         if 'is_free' in json_data and not json_data['is_free']:
@@ -34,7 +34,7 @@ def ximalaya_download_by_id(id, title = None, output_dir = '.', info_only = Fals
         elif stream_id == '0':
             url = json_data['play_path']
     logging.debug('ximalaya_download_by_id: %s' % url)
-    ext = 'm4a' 
+    ext = 'm4a'
     urls = [url]
     print('Site:        %s' % site_info)
     print('title:       %s' % title)
@@ -64,11 +64,11 @@ def ximalaya_download_page(playlist_url, output_dir = '.', info_only = False, st
         for id in ids:
             try:
                 ximalaya_download_by_id(id, output_dir=output_dir, info_only=info_only, stream_id=stream_id)
-            except(ValueError):
+            except ValueError:
                 print("something wrong with %s, perhaps paid item?" % id)
     else:
         raise NotImplementedError(playlist_url)
-    
+
 def ximalaya_download_playlist(url, output_dir='.', info_only=False, stream_id=None, **kwargs):
     match_result = re.match(r'http://www\.ximalaya\.com/(\d+)/album/(\d+)', url)
     if not match_result:
@@ -95,4 +95,4 @@ def print_stream_info(stream_id):
 
 site_info = 'ximalaya.com'
 download = ximalaya_download
-download_playlist = ximalaya_download_playlist 
+download_playlist = ximalaya_download_playlist
diff --git a/src/you_get/extractors/xinpianchang.py b/src/you_get/extractors/xinpianchang.py
index 1121550c..627d0a2e 100644
--- a/src/you_get/extractors/xinpianchang.py
+++ b/src/you_get/extractors/xinpianchang.py
@@ -1,9 +1,10 @@
 #!/usr/bin/env python
 
-import re
 import json
-from ..extractor import VideoExtractor
+import re
+
 from ..common import get_content, playlist_not_supported
+from ..extractor import VideoExtractor
 
 
 class Xinpianchang(VideoExtractor):
diff --git a/src/you_get/extractors/yixia.py b/src/you_get/extractors/yixia.py
index d3d1ef35..33f57eb0 100644
--- a/src/you_get/extractors/yixia.py
+++ b/src/you_get/extractors/yixia.py
@@ -2,10 +2,12 @@
 
 __all__ = ['yixia_download']
 
-from ..common import *
-from urllib.parse import urlparse
-from json import loads
 import re
+from json import loads
+from urllib.parse import urlparse
+
+from ..common import *
+
 
 #----------------------------------------------------------------------
 def miaopai_download_by_smid(smid, output_dir = '.', merge = True, info_only = False):
@@ -65,8 +67,8 @@ def yixia_xiaokaxiu_download_by_scid(scid, output_dir = '.', merge = True, info_
 def yixia_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     """wrapper"""
     hostname = urlparse(url).hostname
-    if 'n.miaopai.com' == hostname: 
-        smid = match1(url, r'n\.miaopai\.com/media/([^.]+)') 
+    if 'n.miaopai.com' == hostname:
+        smid = match1(url, r'n\.miaopai\.com/media/([^.]+)')
         miaopai_download_by_smid(smid, output_dir, merge, info_only)
         return
     elif 'miaopai.com' in hostname:  #Miaopai
diff --git a/src/you_get/extractors/yizhibo.py b/src/you_get/extractors/yizhibo.py
index 11ce86ad..5ee7d379 100644
--- a/src/you_get/extractors/yizhibo.py
+++ b/src/you_get/extractors/yizhibo.py
@@ -2,21 +2,23 @@
 
 __all__ = ['yizhibo_download']
 
-from ..common import *
 import json
 import time
 
+from ..common import *
+
+
 def yizhibo_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     video_id = url[url.rfind('/')+1:].split(".")[0]
     json_request_url = 'http://www.yizhibo.com/live/h5api/get_basic_live_info?scid={}'.format(video_id)
     content = get_content(json_request_url)
     error = json.loads(content)['result']
-    if (error != 1):
+    if error != 1:
         raise ValueError("Error : {}".format(error))
 
     data = json.loads(content)
     title = data.get('data')['live_title']
-    if (title == ''):
+    if title == '':
         title = data.get('data')['nickname']
     m3u8_url = data.get('data')['play_url']
     m3u8 = get_content(m3u8_url)
diff --git a/src/you_get/extractors/youku.py b/src/you_get/extractors/youku.py
index ed0743bb..7767d4ef 100644
--- a/src/you_get/extractors/youku.py
+++ b/src/you_get/extractors/youku.py
@@ -1,14 +1,14 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-from ..common import *
-from ..extractor import VideoExtractor
-
+import json
 import time
 import traceback
-import json
-import urllib.request
 import urllib.parse
+import urllib.request
+
+from ..common import *
+from ..extractor import VideoExtractor
 
 
 def fetch_cna():
diff --git a/src/you_get/extractors/youtube.py b/src/you_get/extractors/youtube.py
index ddf12be9..fecb3989 100644
--- a/src/you_get/extractors/youtube.py
+++ b/src/you_get/extractors/youtube.py
@@ -1,9 +1,11 @@
 #!/usr/bin/env python
+import sys
+
+from xml.dom.minidom import parseString
 
 from ..common import *
 from ..extractor import VideoExtractor
 
-from xml.dom.minidom import parseString
 
 class YouTube(VideoExtractor):
     name = "YouTube"
@@ -179,7 +181,7 @@ class YouTube(VideoExtractor):
             vid = video['playlistVideoRenderer']['videoId']
             try:
                 self.__class__().download_by_url(self.__class__.get_url_from_vid(vid), index=index, **kwargs)
-            except:
+            except Exception:
                 pass
         # FIXME: show DASH stream sizes (by default) for playlist videos
 
@@ -191,7 +193,7 @@ class YouTube(VideoExtractor):
 
             if self.vid is None:
                 self.download_playlist_by_url(self.url, **kwargs)
-                exit(0)
+                sys.exit(0)
 
         if re.search('\Wlist=', self.url) and not kwargs.get('playlist'):
             log.w('This video is from a playlist. (use --playlist to download all videos in the playlist.)')
@@ -232,11 +234,11 @@ class YouTube(VideoExtractor):
                         else:
                             self.html5player = None
 
-                    except:
+                    except Exception:
                         # ytplayer_config = {args:{raw_player_response:ytInitialPlayerResponse}}
                         try:  # FIXME: we should extract ytInitialPlayerResponse more reliably
                             ytInitialPlayerResponse = json.loads(re.search('ytInitialPlayerResponse\s*=\s*([^\n]+?});</script>', video_page).group(1))
-                        except:
+                        except Exception:
                             ytInitialPlayerResponse = json.loads(re.search('ytInitialPlayerResponse\s*=\s*([^\n]+?});', video_page).group(1))
 
                         stream_list = ytInitialPlayerResponse['streamingData']['formats']
@@ -247,7 +249,7 @@ class YouTube(VideoExtractor):
                         else:
                             self.html5player = None
 
-                except:
+                except Exception:
                     if 'url_encoded_fmt_stream_map' not in video_info:
                         stream_list = json.loads(video_info['player_response'][0])['streamingData']['formats']
                     else:
@@ -264,7 +266,7 @@ class YouTube(VideoExtractor):
 
                 try:  # FIXME: we should extract ytInitialPlayerResponse more reliably
                     ytInitialPlayerResponse = json.loads(re.search('ytInitialPlayerResponse\s*=\s*([^\n]+?});</script>', video_page).group(1))
-                except:
+                except Exception:
                     ytInitialPlayerResponse = json.loads(re.search('ytInitialPlayerResponse\s*=\s*([^\n]+?});', video_page).group(1))
 
                 self.title = ytInitialPlayerResponse["videoDetails"]["title"]
@@ -299,7 +301,7 @@ class YouTube(VideoExtractor):
 
                 try:
                     ytplayer_config = json.loads(re.search('ytplayer.config\s*=\s*([^\n]+});ytplayer', video_page).group(1))
-                except:
+                except Exception:
                     msg = re.search('class="message">([^<]+)<', video_page).group(1)
                     log.wtf('[Failed] Got message "%s". Try to login with --cookies.' % msg.strip())
 
@@ -339,7 +341,7 @@ class YouTube(VideoExtractor):
                 return
             else:
                 download_url_ffmpeg(hlsvp, self.title, 'mp4')
-                exit(0)
+                sys.exit(0)
 
         for stream in stream_list:
             if isinstance(stream, str):
@@ -376,7 +378,7 @@ class YouTube(VideoExtractor):
         try:
             try:
                 caption_tracks = json.loads(ytplayer_config['args']['player_response'])['captions']['playerCaptionsTracklistRenderer']['captionTracks']
-            except:
+            except Exception:
                 caption_tracks = ytInitialPlayerResponse['captions']['playerCaptionsTracklistRenderer']['captionTracks']
             for ct in caption_tracks:
                 ttsurl, lang = ct['baseUrl'], ct['languageCode']
@@ -386,7 +388,8 @@ class YouTube(VideoExtractor):
                 texts = transcript.getElementsByTagName('text')
                 srt = ""; seq = 0
                 for text in texts:
-                    if text.firstChild is None: continue # empty element
+                    if text.firstChild is None:
+                        continue # empty element
                     seq += 1
                     start = float(text.getAttribute('start'))
                     if text.getAttribute('dur'):
@@ -404,7 +407,8 @@ class YouTube(VideoExtractor):
                     srt += '%s\n\n' % content
 
                 self.caption_tracks[lang] = srt
-        except: pass
+        except Exception:
+            pass
 
         # Prepare DASH streams (NOTE: not every video has DASH streams!)
         try:
@@ -418,16 +422,20 @@ class YouTube(VideoExtractor):
                     dash_mp4_a_url = burls[0].firstChild.nodeValue
                     dash_mp4_a_size = burls[0].getAttribute('yt:contentLength')
                     if not dash_mp4_a_size:
-                        try: dash_mp4_a_size = url_size(dash_mp4_a_url)
-                        except: continue
+                        try:
+                            dash_mp4_a_size = url_size(dash_mp4_a_url)
+                        except Exception:
+                            continue
                 elif mimeType == 'audio/webm':
                     rep = aset.getElementsByTagName('Representation')[-1]
                     burls = rep.getElementsByTagName('BaseURL')
                     dash_webm_a_url = burls[0].firstChild.nodeValue
                     dash_webm_a_size = burls[0].getAttribute('yt:contentLength')
                     if not dash_webm_a_size:
-                        try: dash_webm_a_size = url_size(dash_webm_a_url)
-                        except: continue
+                        try:
+                            dash_webm_a_size = url_size(dash_webm_a_url)
+                        except Exception:
+                            continue
                 elif mimeType == 'video/mp4':
                     for rep in aset.getElementsByTagName('Representation'):
                         w = int(rep.getAttribute('width'))
@@ -437,8 +445,10 @@ class YouTube(VideoExtractor):
                         dash_url = burls[0].firstChild.nodeValue
                         dash_size = burls[0].getAttribute('yt:contentLength')
                         if not dash_size:
-                            try: dash_size = url_size(dash_url)
-                            except: continue
+                            try:
+                                dash_size = url_size(dash_url)
+                            except Exception:
+                                continue
                         dash_urls = self.__class__.chunk_by_range(dash_url, int(dash_size))
                         dash_mp4_a_urls = self.__class__.chunk_by_range(dash_mp4_a_url, int(dash_mp4_a_size))
                         self.dash_streams[itag] = {
@@ -459,8 +469,10 @@ class YouTube(VideoExtractor):
                         dash_url = burls[0].firstChild.nodeValue
                         dash_size = burls[0].getAttribute('yt:contentLength')
                         if not dash_size:
-                            try: dash_size = url_size(dash_url)
-                            except: continue
+                            try:
+                                dash_size = url_size(dash_url)
+                            except Exception:
+                                continue
                         dash_urls = self.__class__.chunk_by_range(dash_url, int(dash_size))
                         dash_webm_a_urls = self.__class__.chunk_by_range(dash_webm_a_url, int(dash_webm_a_size))
                         self.dash_streams[itag] = {
@@ -472,7 +484,7 @@ class YouTube(VideoExtractor):
                             'src': [dash_urls, dash_webm_a_urls],
                             'size': int(dash_size) + int(dash_webm_a_size)
                         }
-        except:
+        except Exception:
             # VEVO
             if not self.html5player: return
             self.html5player = self.html5player.replace('\/', '/') # unescape URL (for age-restricted videos)
@@ -484,7 +496,7 @@ class YouTube(VideoExtractor):
                                   parse.unquote(i.split('=')[1]))
                                  for i in afmt.split('&')])
                            for afmt in ytplayer_config['args']['adaptive_fmts'].split(',')]
-            except:
+            except Exception:
                 if 'adaptive_fmts' in video_info:
                     streams = [dict([(i.split('=')[0],
                                       parse.unquote(i.split('=')[1]))
@@ -494,9 +506,9 @@ class YouTube(VideoExtractor):
                     try:
                         try:
                             streams = json.loads(video_info['player_response'][0])['streamingData']['adaptiveFormats']
-                        except:
+                        except Exception:
                             streams = ytInitialPlayerResponse['streamingData']['adaptiveFormats']
-                    except:  # no DASH stream at all
+                    except Exception:  # no DASH stream at all
                         return
 
                     # streams without contentLength got broken urls, just remove them (#2767)
@@ -603,7 +615,7 @@ class YouTube(VideoExtractor):
             if stream_id not in self.streams and stream_id not in self.dash_streams:
                 log.e('[Error] Invalid video format.')
                 log.e('Run \'-i\' command with no specific video format to view all available formats.')
-                exit(2)
+                sys.exit(2)
         else:
             # Extract stream with the best quality
             stream_id = self.streams_sorted[0]['itag']
diff --git a/src/you_get/extractors/zhanqi.py b/src/you_get/extractors/zhanqi.py
index 8daf3413..317b610d 100644
--- a/src/you_get/extractors/zhanqi.py
+++ b/src/you_get/extractors/zhanqi.py
@@ -2,11 +2,13 @@
 
 __all__ = ['zhanqi_download']
 
-from ..common import *
-import json
 import base64
+import json
 from urllib.parse import urlparse
 
+from ..common import *
+
+
 def zhanqi_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     path = urlparse(url).path[1:]
 
diff --git a/src/you_get/extractors/zhibo.py b/src/you_get/extractors/zhibo.py
index a6143c30..69ba1c78 100644
--- a/src/you_get/extractors/zhibo.py
+++ b/src/you_get/extractors/zhibo.py
@@ -4,6 +4,7 @@ __all__ = ['zhibo_download']
 
 from ..common import *
 
+
 def zhibo_vedio_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     # http://video.zhibo.tv/video/details/d103057f-663e-11e8-9d83-525400ccac43.html
 
diff --git a/src/you_get/extractors/zhihu.py b/src/you_get/extractors/zhihu.py
index 1dceef53..47eb5c45 100644
--- a/src/you_get/extractors/zhihu.py
+++ b/src/you_get/extractors/zhihu.py
@@ -2,9 +2,10 @@
 
 __all__ = ['zhihu_download', 'zhihu_download_playlist']
 
-from ..common import *
 import json
 
+from ..common import *
+
 
 def zhihu_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
     paths = url.split("/")
diff --git a/src/you_get/json_output.py b/src/you_get/json_output.py
index c6195761..f64e7618 100644
--- a/src/you_get/json_output.py
+++ b/src/you_get/json_output.py
@@ -34,7 +34,7 @@ def output(video_extractor, pretty_print=True):
         print(json.dumps(out))
 
 # a fake VideoExtractor object to save info
-class VideoExtractor(object):
+class VideoExtractor():
     pass
 
 def print_info(site_info=None, title=None, type=None, size=None):
diff --git a/src/you_get/processor/__init__.py b/src/you_get/processor/__init__.py
index d728385d..3dd665a9 100644
--- a/src/you_get/processor/__init__.py
+++ b/src/you_get/processor/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
+from .ffmpeg import *
 from .join_flv import concat_flv
 from .join_mp4 import concat_mp4
-from .ffmpeg import *
 from .rtmpdump import *
diff --git a/src/you_get/processor/ffmpeg.py b/src/you_get/processor/ffmpeg.py
index 50e2c9fe..e0f3ef5e 100755
--- a/src/you_get/processor/ffmpeg.py
+++ b/src/you_get/processor/ffmpeg.py
@@ -4,15 +4,16 @@ import logging
 import os
 import subprocess
 import sys
-from ..util.strings import parameterize
+
 from ..common import print_more_compatible as print
+from ..util.strings import parameterize
 
 try:
     from subprocess import DEVNULL
 except ImportError:
     # Python 3.2 or below
-    import os
     import atexit
+    import os
     DEVNULL = os.open(os.devnull, os.O_RDWR)
     atexit.register(lambda fd: os.close(fd), DEVNULL)
 
@@ -20,15 +21,15 @@ def get_usable_ffmpeg(cmd):
     try:
         p = subprocess.Popen([cmd, '-version'], stdin=DEVNULL, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         out, err = p.communicate()
-        vers = str(out, 'utf-8').split('\n')[0].split()
+        vers = str(out, 'utf-8').split('\n', maxsplit=1)[0].split()
         assert (vers[0] == 'ffmpeg' and vers[2][0] > '0') or (vers[0] == 'avconv')
         try:
             v = vers[2][1:] if vers[2][0] == 'n' else vers[2]
             version = [int(i) for i in v.split('.')]
-        except:
+        except Exception:
             version = [1, 0]
         return cmd, 'ffprobe', version
-    except:
+    except Exception:
         return None
 
 FFMPEG, FFPROBE, FFMPEG_VERSION = get_usable_ffmpeg('ffmpeg') or get_usable_ffmpeg('avconv') or (None, None, None)
@@ -58,16 +59,20 @@ def ffmpeg_concat_av(files, output, ext):
     print('Merging video parts... ', end="", flush=True)
     params = [FFMPEG] + LOGLEVEL
     for file in files:
-        if os.path.isfile(file): params.extend(['-i', file])
+        if os.path.isfile(file):
+            params.extend(['-i', file])
     params.extend(['-c', 'copy'])
     params.extend(['--', output])
     if subprocess.call(params, stdin=STDIN):
         print('Merging without re-encode failed.\nTry again re-encoding audio... ', end="", flush=True)
-        try: os.remove(output)
-        except FileNotFoundError: pass
+        try:
+            os.remove(output)
+        except FileNotFoundError:
+            pass
         params = [FFMPEG] + LOGLEVEL
         for file in files:
-            if os.path.isfile(file): params.extend(['-i', file])
+            if os.path.isfile(file):
+                params.extend(['-i', file])
         params.extend(['-c:v', 'copy'])
         if ext == 'mp4':
             params.extend(['-c:a', 'aac'])
@@ -137,11 +142,8 @@ def ffmpeg_concat_ts_to_mkv(files, output='output.mkv'):
     params.extend(['--', output])
 
     try:
-        if subprocess.call(params, stdin=STDIN) == 0:
-            return True
-        else:
-            return False
-    except:
+        return subprocess.call(params, stdin=STDIN) == 0
+    except Exception:
         return False
 
 def ffmpeg_concat_flv_to_mp4(files, output='output.mp4'):
@@ -245,7 +247,7 @@ def ffmpeg_download_stream(files, title, ext, params={}, output_dir='.', stream=
     """
     output = title + '.' + ext
 
-    if not (output_dir == '.'):
+    if not output_dir == '.':
         output = output_dir + '/' + output
 
     print('Downloading streaming content with FFmpeg, press q to stop recording...')
@@ -276,7 +278,7 @@ def ffmpeg_download_stream(files, title, ext, params={}, output_dir='.', stream=
     except KeyboardInterrupt:
         try:
             a.stdin.write('q'.encode('utf-8'))
-        except:
+        except Exception:
             pass
 
     return True
diff --git a/src/you_get/processor/join_flv.py b/src/you_get/processor/join_flv.py
index 4ac7aadb..540ec552 100755
--- a/src/you_get/processor/join_flv.py
+++ b/src/you_get/processor/join_flv.py
@@ -299,7 +299,7 @@ def concat_flv(flvs, output = None):
         output = guess_output(flvs)
     elif os.path.isdir(output):
         output = os.path.join(output, guess_output(flvs))
-    
+
     print('Merging video parts...')
     ins = [open(flv, 'rb') for flv in flvs]
     for stream in ins:
@@ -309,13 +309,13 @@ def concat_flv(flvs, output = None):
     meta_types, metas = zip(*metas)
     assert len(set(meta_types)) == 1
     meta_type = meta_types[0]
-    
+
     # must merge fields: duration
     # TODO: check other meta info, update other meta info
     total_duration = sum(meta.get('duration') for meta in metas)
     meta_data = metas[0]
     meta_data.set('duration', total_duration)
-    
+
     out = open(output, 'wb')
     write_flv_header(out)
     write_meta_tag(out, meta_type, meta_data)
@@ -332,14 +332,15 @@ def concat_flv(flvs, output = None):
                 break
         timestamp_start = timestamp
     write_uint(out, previous_tag_size)
-    
+
     return output
 
 def usage():
     print('Usage: [python3] join_flv.py --output TARGET.flv flv...')
 
 def main():
-    import sys, getopt
+    import getopt
+    import sys
     try:
         opts, args = getopt.getopt(sys.argv[1:], "ho:", ["help", "output="])
     except getopt.GetoptError as err:
@@ -358,7 +359,7 @@ def main():
     if not args:
         usage()
         sys.exit(1)
-    
+
     concat_flv(args, output)
 
 if __name__ == '__main__':
diff --git a/src/you_get/processor/join_mp4.py b/src/you_get/processor/join_mp4.py
index 8eca239c..5a4f8209 100755
--- a/src/you_get/processor/join_mp4.py
+++ b/src/you_get/processor/join_mp4.py
@@ -9,6 +9,7 @@
 import struct
 from io import BytesIO
 
+
 def skip(stream, n):
     stream.seek(stream.tell() + n)
 
@@ -167,14 +168,14 @@ def read_mvhd(stream, size, left, type):
     body, stream = read_body_stream(stream, left)
     value = read_full_atom(stream)
     left -= 4
-    
-    # new Date(movieTime * 1000 - 2082850791998L); 
+
+    # new Date(movieTime * 1000 - 2082850791998L);
     creation_time = read_uint(stream)
     modification_time = read_uint(stream)
     time_scale = read_uint(stream)
     duration = read_uint(stream)
     left -= 16
-    
+
     qt_preferred_fate = read_uint(stream)
     qt_preferred_volume = read_ushort(stream)
     assert stream.read(10) == b'\x00' * 10
@@ -202,15 +203,15 @@ def read_tkhd(stream, size, left, type):
     body, stream = read_body_stream(stream, left)
     value = read_full_atom(stream)
     left -= 4
-    
-    # new Date(movieTime * 1000 - 2082850791998L); 
+
+    # new Date(movieTime * 1000 - 2082850791998L);
     creation_time = read_uint(stream)
     modification_time = read_uint(stream)
     track_id = read_uint(stream)
     assert stream.read(4) == b'\x00' * 4
     duration = read_uint(stream)
     left -= 20
-    
+
     assert stream.read(8) == b'\x00' * 8
     qt_layer = read_ushort(stream)
     qt_alternate_group = read_ushort(stream)
@@ -245,7 +246,7 @@ def read_mdhd(stream, size, left, type):
         duration = read_ulong(stream)
         var = [('duration', 24, duration, 8)]
         left -= 28
-    else: 
+    else:
         assert ver == 0, "ver=%d" % ver
         creation_time = read_uint(stream)
         modification_time = read_uint(stream)
@@ -253,11 +254,11 @@ def read_mdhd(stream, size, left, type):
         duration = read_uint(stream)
         var = [('duration', 16, duration, 4)]
         left -= 16
-    
+
     packed_language = read_ushort(stream)
     qt_quality = read_ushort(stream)
     left -= 4
-    
+
     assert left == 0
     return VariableAtom(b'mdhd', size, body, var)
 
@@ -265,45 +266,45 @@ def read_hdlr(stream, size, left, type):
     body, stream = read_body_stream(stream, left)
     value = read_full_atom(stream)
     left -= 4
-    
+
     qt_component_type = read_uint(stream)
     handler_type = read_uint(stream)
     qt_component_manufacturer = read_uint(stream)
     qt_component_flags = read_uint(stream)
     qt_component_flags_mask = read_uint(stream)
     left -= 20
-    
+
     track_name = stream.read(left)
     #assert track_name[-1] == b'\x00'
-    
+
     return Atom(b'hdlr', size, body)
 
 def read_vmhd(stream, size, left, type):
     body, stream = read_body_stream(stream, left)
     value = read_full_atom(stream)
     left -= 4
-    
+
     assert left == 8
     graphic_mode = read_ushort(stream)
     op_color_read = read_ushort(stream)
     op_color_green = read_ushort(stream)
     op_color_blue = read_ushort(stream)
-    
+
     return Atom(b'vmhd', size, body)
 
 def read_stsd(stream, size, left, type):
     value = read_full_atom(stream)
     left -= 4
-    
+
     entry_count = read_uint(stream)
     left -= 4
-    
+
     children = []
     for i in range(entry_count):
         atom = read_atom(stream)
         children.append(atom)
         left -= atom.size
-    
+
     assert left == 0
     #return Atom('stsd', size, children)
     class stsd_atom(Atom):
@@ -324,7 +325,7 @@ def read_stsd(stream, size, left, type):
 
 def read_avc1(stream, size, left, type):
     body, stream = read_body_stream(stream, left)
-    
+
     skip_zeros(stream, 6)
     data_reference_index = read_ushort(stream)
     skip_zeros(stream, 2)
@@ -341,7 +342,7 @@ def read_avc1(stream, size, left, type):
     depth = read_ushort(stream)
     assert stream.read(2) == b'\xff\xff'
     left -= 78
-    
+
     child = read_atom(stream)
     assert child.type in (b'avcC', b'pasp'), 'if the sub atom is not avcC or pasp (actual %s), you should not cache raw body' % child.type
     left -= child.size
@@ -355,11 +356,11 @@ def read_avcC(stream, size, left, type):
 def read_stts(stream, size, left, type):
     value = read_full_atom(stream)
     left -= 4
-    
+
     entry_count = read_uint(stream)
     #assert entry_count == 1
     left -= 4
-    
+
     samples = []
     for i in range(entry_count):
         sample_count = read_uint(stream)
@@ -389,16 +390,16 @@ def read_stts(stream, size, left, type):
 def read_stss(stream, size, left, type):
     value = read_full_atom(stream)
     left -= 4
-    
+
     entry_count = read_uint(stream)
     left -= 4
-    
+
     samples = []
     for i in range(entry_count):
-            sample = read_uint(stream)
-            samples.append(sample)
-            left -= 4
-    
+        sample = read_uint(stream)
+        samples.append(sample)
+        left -= 4
+
     assert left == 0
     #return Atom('stss', size, None)
     class stss_atom(Atom):
@@ -418,10 +419,10 @@ def read_stss(stream, size, left, type):
 def read_stsc(stream, size, left, type):
     value = read_full_atom(stream)
     left -= 4
-    
+
     entry_count = read_uint(stream)
     left -= 4
-    
+
     chunks = []
     for i in range(entry_count):
         first_chunk = read_uint(stream)
@@ -435,7 +436,7 @@ def read_stsc(stream, size, left, type):
     #for c, s in zip(chunks[1:], samples):
     #	total += c*s
     #print 'total', total
-    
+
     assert left == 0
     #return Atom('stsc', size, None)
     class stsc_atom(Atom):
@@ -457,11 +458,11 @@ def read_stsc(stream, size, left, type):
 def read_stsz(stream, size, left, type):
     value = read_full_atom(stream)
     left -= 4
-    
+
     sample_size = read_uint(stream)
     sample_count = read_uint(stream)
     left -= 8
-    
+
     assert sample_size == 0
     total = 0
     sizes = []
@@ -471,7 +472,7 @@ def read_stsz(stream, size, left, type):
             sizes.append(entry_size)
             total += entry_size
             left -= 4
-    
+
     assert left == 0
     #return Atom('stsz', size, None)
     class stsz_atom(Atom):
@@ -492,16 +493,16 @@ def read_stsz(stream, size, left, type):
 def read_stco(stream, size, left, type):
     value = read_full_atom(stream)
     left -= 4
-    
+
     entry_count = read_uint(stream)
     left -= 4
-    
+
     offsets = []
     for i in range(entry_count):
         chunk_offset = read_uint(stream)
         offsets.append(chunk_offset)
         left -= 4
-    
+
     assert left == 0
     #return Atom('stco', size, None)
     class stco_atom(Atom):
@@ -521,17 +522,17 @@ def read_stco(stream, size, left, type):
 def read_ctts(stream, size, left, type):
     value = read_full_atom(stream)
     left -= 4
-    
+
     entry_count = read_uint(stream)
     left -= 4
-    
+
     samples = []
     for i in range(entry_count):
         sample_count = read_uint(stream)
         sample_offset = read_uint(stream)
         samples.append((sample_count, sample_offset))
         left -= 8
-    
+
     assert left == 0
     class ctts_atom(Atom):
         def __init__(self, type, size, body):
@@ -552,17 +553,17 @@ def read_smhd(stream, size, left, type):
     body, stream = read_body_stream(stream, left)
     value = read_full_atom(stream)
     left -= 4
-    
+
     balance = read_ushort(stream)
     assert stream.read(2) == b'\x00\x00'
     left -= 4
-    
+
     assert left == 0
     return Atom(b'smhd', size, body)
 
 def read_mp4a(stream, size, left, type):
     body, stream = read_body_stream(stream, left)
-    
+
     assert stream.read(6) == b'\x00' * 6
     data_reference_index = read_ushort(stream)
     assert stream.read(8) == b'\x00' * 8
@@ -572,11 +573,11 @@ def read_mp4a(stream, size, left, type):
     time_scale = read_ushort(stream)
     assert stream.read(2) == b'\x00' * 2
     left -= 28
-    
+
     atom = read_atom(stream)
     assert atom.type == b'esds'
     left -= atom.size
-    
+
     assert left == 0
     return Atom(b'mp4a', size, body)
 
@@ -590,7 +591,7 @@ def read_esds(stream, size, left, type):
     assert version == 0
     flags = value & 0xffffff
     left -= 4
-    
+
     body = stream.read(left)
     return Atom(b'esds', size, None)
 
@@ -642,7 +643,7 @@ atom_readers = {
     b'smhd': read_smhd, # nothing
     b'mp4a': read_mp4a, # nothing
     b'esds': read_esds, # noting
-    
+
     b'ftyp': read_raw,
     b'yqoo': read_raw,
     b'moov': read_composite_atom,
@@ -660,21 +661,21 @@ atom_readers = {
     b'mdat': read_mdat,
     b'udta': read_udta,
 }
-#stsd sample descriptions (codec types, initialization etc.) 
-#stts (decoding) time-to-sample  
-#ctts (composition) time to sample 
-#stsc sample-to-chunk, partial data-offset information 
-#stsz sample sizes (framing) 
-#stz2 compact sample sizes (framing) 
-#stco chunk offset, partial data-offset information 
-#co64 64-bit chunk offset 
-#stss sync sample table (random access points) 
-#stsh shadow sync sample table 
-#padb sample padding bits 
-#stdp sample degradation priority 
-#sdtp independent and disposable samples 
-#sbgp sample-to-group 
-#sgpd sample group description 
+#stsd sample descriptions (codec types, initialization etc.)
+#stts (decoding) time-to-sample
+#ctts (composition) time to sample
+#stsc sample-to-chunk, partial data-offset information
+#stsz sample sizes (framing)
+#stz2 compact sample sizes (framing)
+#stco chunk offset, partial data-offset information
+#co64 64-bit chunk offset
+#stss sync sample table (random access points)
+#stsh shadow sync sample table
+#padb sample padding bits
+#stdp sample degradation priority
+#sdtp independent and disposable samples
+#sbgp sample-to-group
+#sgpd sample group description
 #subs sub-sample information
 
 
@@ -693,7 +694,7 @@ def read_atom(stream):
     if size == 1:
         size = read_ulong(stream)
         n += 8
-    
+
     left = size - n
     if type in atom_readers:
         return atom_readers[type](stream, size, left, type)
@@ -802,28 +803,28 @@ def merge_moov(moovs, mdats):
         mdhd_durations[0] += traks[0].get(b'mdia', b'mdhd').get('duration')
         mdhd_durations[1] += traks[1].get(b'mdia', b'mdhd').get('duration')
     #mvhd_duration = min(mvhd_duration, tkhd_durations)
-    
+
     trak0s = [x.get_all(b'trak')[0] for x in moovs]
     trak1s = [x.get_all(b'trak')[1] for x in moovs]
-    
+
     stts0 = merge_stts(x.get(b'mdia', b'minf', b'stbl', b'stts').body[1] for x in trak0s)
     stts1 = merge_stts(x.get(b'mdia', b'minf', b'stbl', b'stts').body[1] for x in trak1s)
-    
+
     stss = merge_stss((x.get(b'mdia', b'minf', b'stbl', b'stss').body[1] for x in trak0s), (len(x.get(b'mdia', b'minf', b'stbl', b'stsz').body[3]) for x in trak0s))
-    
+
     stsc0 = merge_stsc((x.get(b'mdia', b'minf', b'stbl', b'stsc').body[1] for x in trak0s), (len(x.get(b'mdia', b'minf', b'stbl', b'stco').body[1]) for x in trak0s))
     stsc1 = merge_stsc((x.get(b'mdia', b'minf', b'stbl', b'stsc').body[1] for x in trak1s), (len(x.get(b'mdia', b'minf', b'stbl', b'stco').body[1]) for x in trak1s))
-    
+
     stco0 = merge_stco((x.get(b'mdia', b'minf', b'stbl', b'stco').body[1] for x in trak0s), mdats)
     stco1 = merge_stco((x.get(b'mdia', b'minf', b'stbl', b'stco').body[1] for x in trak1s), mdats)
-    
+
     stsz0 = merge_stsz((x.get(b'mdia', b'minf', b'stbl', b'stsz').body[3] for x in trak0s))
     stsz1 = merge_stsz((x.get(b'mdia', b'minf', b'stbl', b'stsz').body[3] for x in trak1s))
-    
+
     ctts = sum((x.get(b'mdia', b'minf', b'stbl', b'ctts').body[1] for x in trak0s), [])
-    
+
     moov = moovs[0]
-    
+
     moov.get(b'mvhd').set('duration', mvhd_duration)
     trak0 = moov.get_all(b'trak')[0]
     trak1 = moov.get_all(b'trak')[1]
@@ -831,33 +832,33 @@ def merge_moov(moovs, mdats):
     trak1.get(b'tkhd').set('duration', tkhd_durations[1])
     trak0.get(b'mdia', b'mdhd').set('duration', mdhd_durations[0])
     trak1.get(b'mdia', b'mdhd').set('duration', mdhd_durations[1])
-    
+
     stts_atom = trak0.get(b'mdia', b'minf', b'stbl', b'stts')
     stts_atom.body = stts_atom.body[0], stts0
     stts_atom = trak1.get(b'mdia', b'minf', b'stbl', b'stts')
     stts_atom.body = stts_atom.body[0], stts1
-    
+
     stss_atom = trak0.get(b'mdia', b'minf', b'stbl', b'stss')
     stss_atom.body = stss_atom.body[0], stss
-    
+
     stsc_atom = trak0.get(b'mdia', b'minf', b'stbl', b'stsc')
     stsc_atom.body = stsc_atom.body[0], stsc0
     stsc_atom = trak1.get(b'mdia', b'minf', b'stbl', b'stsc')
     stsc_atom.body = stsc_atom.body[0], stsc1
-    
+
     stco_atom = trak0.get(b'mdia', b'minf', b'stbl', b'stco')
     stco_atom.body = stss_atom.body[0], stco0
     stco_atom = trak1.get(b'mdia', b'minf', b'stbl', b'stco')
     stco_atom.body = stss_atom.body[0], stco1
-    
+
     stsz_atom = trak0.get(b'mdia', b'minf', b'stbl', b'stsz')
     stsz_atom.body = stsz_atom.body[0], stsz_atom.body[1], len(stsz0), stsz0
     stsz_atom = trak1.get(b'mdia', b'minf', b'stbl', b'stsz')
     stsz_atom.body = stsz_atom.body[0], stsz_atom.body[1], len(stsz1), stsz1
-    
+
     ctts_atom = trak0.get(b'mdia', b'minf', b'stbl', b'ctts')
     ctts_atom.body = ctts_atom.body[0], ctts
-    
+
     old_moov_size = moov.size
     new_moov_size = moov.calsize()
     new_mdat_start = mdats[0].body[1] + new_moov_size - old_moov_size
@@ -867,7 +868,7 @@ def merge_moov(moovs, mdats):
     stco_atom.body = stss_atom.body[0], stco0
     stco_atom = trak1.get(b'mdia', b'minf', b'stbl', b'stco')
     stco_atom.body = stss_atom.body[0], stco1
-    
+
     return moov
 
 def merge_mp4s(files, output):
@@ -909,17 +910,18 @@ def concat_mp4(mp4s, output = None):
         output = guess_output(mp4s)
     elif os.path.isdir(output):
         output = os.path.join(output, guess_output(mp4s))
-    
+
     print('Merging video parts...')
     merge_mp4s(mp4s, output)
-    
+
     return output
 
 def usage():
     print('Usage: [python3] join_mp4.py --output TARGET.mp4 mp4...')
 
 def main():
-    import sys, getopt
+    import getopt
+    import sys
     try:
         opts, args = getopt.getopt(sys.argv[1:], "ho:", ["help", "output="])
     except getopt.GetoptError as err:
@@ -938,7 +940,7 @@ def main():
     if not args:
         usage()
         sys.exit(1)
-    
+
     concat_mp4(args, output)
 
 if __name__ == '__main__':
diff --git a/src/you_get/processor/join_ts.py b/src/you_get/processor/join_ts.py
index 92640108..a9f33205 100644
--- a/src/you_get/processor/join_ts.py
+++ b/src/you_get/processor/join_ts.py
@@ -23,9 +23,9 @@ def concat_ts(ts_parts, output = None):
         output = guess_output(ts_parts)
     elif os.path.isdir(output):
         output = os.path.join(output, guess_output(ts_parts))
-    
+
     print('Merging video parts...')
-    
+
     ts_out_file = open(output, "wb")
     for ts_in in ts_parts:
         ts_in_file = open(ts_in, "rb")
@@ -39,7 +39,8 @@ def usage():
     print('Usage: [python3] join_ts.py --output TARGET.ts ts...')
 
 def main():
-    import sys, getopt
+    import getopt
+    import sys
     try:
         opts, args = getopt.getopt(sys.argv[1:], "ho:", ["help", "output="])
     except getopt.GetoptError as err:
@@ -58,7 +59,7 @@ def main():
     if not args:
         usage()
         sys.exit(1)
-    
+
     concat_ts(args, output)
 
 if __name__ == '__main__':
diff --git a/src/you_get/processor/rtmpdump.py b/src/you_get/processor/rtmpdump.py
index f1ab9a4b..1144aaad 100644
--- a/src/you_get/processor/rtmpdump.py
+++ b/src/you_get/processor/rtmpdump.py
@@ -3,12 +3,13 @@
 import os.path
 import subprocess
 
+
 def get_usable_rtmpdump(cmd):
     try:
         p = subprocess.Popen([cmd], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         out, err = p.communicate()
         return cmd
-    except:
+    except Exception:
         return None
 
 RTMPDUMP = get_usable_rtmpdump('rtmpdump')
@@ -32,7 +33,7 @@ def download_rtmpdump_stream(url, title, ext,params={},output_dir='.'):
 
     for key in params.keys():
         cmdline.append(key)
-        if params[key]!=None:
+        if params[key] is not None:
             cmdline.append(params[key])
 
     # cmdline.append('-y')
@@ -43,15 +44,15 @@ def download_rtmpdump_stream(url, title, ext,params={},output_dir='.'):
 
 #
 def play_rtmpdump_stream(player, url, params={}):
-    
+
     #construct left side of pipe
     cmdline = [RTMPDUMP, '-r']
     cmdline.append(url)
-    
+
     #append other params if exist
     for key in params.keys():
         cmdline.append(key)
-        if params[key]!=None:
+        if params[key] is not None:
             cmdline.append(params[key])
 
     cmdline.append('-o')
@@ -67,6 +68,6 @@ def play_rtmpdump_stream(player, url, params={}):
 
     #call RTMPDump!
     subprocess.call(cmdline)
-    
+
     # os.system("rtmpdump -r '%s' -y '%s' -o - | %s -" % (url, playpath, player))
     return
diff --git a/src/you_get/util/fs.py b/src/you_get/util/fs.py
index c04a10a7..01fc693b 100644
--- a/src/you_get/util/fs.py
+++ b/src/you_get/util/fs.py
@@ -2,6 +2,7 @@
 
 from .os import detect_os
 
+
 def legitimize(text, os=detect_os()):
     """Converts a string to a valid filename.
     """
diff --git a/src/you_get/util/git.py b/src/you_get/util/git.py
index f686cc40..835e3246 100644
--- a/src/you_get/util/git.py
+++ b/src/you_get/util/git.py
@@ -2,8 +2,10 @@
 
 import os
 import subprocess
+
 from ..version import __version__
 
+
 def get_head(repo_path):
     """Get (branch, commit) from HEAD of a git repo."""
     try:
@@ -11,7 +13,7 @@ def get_head(repo_path):
         branch = ref[-1]
         commit = open(os.path.join(repo_path, '.git', *ref), 'r').read().strip()[:7]
         return branch, commit
-    except:
+    except Exception:
         return None
 
 def get_version(repo_path):
@@ -35,5 +37,5 @@ def get_version(repo_path):
         cc = c_head - c_master
         assert cc
         return '%s.%s.%s' % (major, minor, cn + cc)
-    except:
+    except Exception:
         return __version__
diff --git a/src/you_get/util/log.py b/src/you_get/util/log.py
index 81fd1bf5..9993e71c 100644
--- a/src/you_get/util/log.py
+++ b/src/you_get/util/log.py
@@ -1,9 +1,10 @@
 #!/usr/bin/env python
 # This file is Python 2 compliant.
 
-from ..version import script_name
+import os
+import sys
 
-import os, sys
+from ..version import script_name
 
 TERM = os.getenv('TERM', '')
 IS_ANSI_TERMINAL = TERM in (
diff --git a/src/you_get/util/os.py b/src/you_get/util/os.py
index 1a00d2b5..86bfbe87 100644
--- a/src/you_get/util/os.py
+++ b/src/you_get/util/os.py
@@ -2,6 +2,7 @@
 
 from platform import system
 
+
 def detect_os():
     """Detect operating system.
     """
@@ -23,7 +24,8 @@ def detect_os():
             with open('/proc/version', 'r') as f:
                 if 'microsoft' in f.read().lower():
                     os = 'wsl'
-        except: pass
+        except Exception:
+            pass
     elif 'windows' in syst:
         os = 'windows'
     elif 'bsd' in syst:
diff --git a/src/you_get/util/strings.py b/src/you_get/util/strings.py
index 26d55594..99b3f994 100644
--- a/src/you_get/util/strings.py
+++ b/src/you_get/util/strings.py
@@ -21,6 +21,7 @@ except ImportError:
 
 from .fs import legitimize
 
+
 def get_filename(htmlstring):
     return legitimize(unescape_html(htmlstring))
 
diff --git a/src/you_get/util/term.py b/src/you_get/util/term.py
index 291faae8..b3ad8f01 100644
--- a/src/you_get/util/term.py
+++ b/src/you_get/util/term.py
@@ -3,7 +3,9 @@
 def get_terminal_size():
     """Get (width, height) of the current terminal."""
     try:
-        import fcntl, termios, struct # fcntl module only available on Unix
+        import fcntl  # fcntl module only available on Unix
+        import struct
+        import termios
         return struct.unpack('hh', fcntl.ioctl(1, termios.TIOCGWINSZ, '1234'))
-    except:
+    except Exception:
         return (40, 80)
diff --git a/tests/test.py b/tests/test.py
index 877b6935..21bfbe21 100644
--- a/tests/test.py
+++ b/tests/test.py
@@ -2,18 +2,8 @@
 
 import unittest
 
-from you_get.extractors import (
-    imgur,
-    magisto,
-    youtube,
-    missevan,
-    acfun,
-    bilibili,
-    soundcloud,
-    tiktok,
-    twitter,
-    miaopai
-)
+from you_get.extractors import (acfun, bilibili, imgur, magisto, miaopai,
+                                missevan, soundcloud, tiktok, twitter, youtube)
 
 
 class YouGetTests(unittest.TestCase):
diff --git a/tests/test_common.py b/tests/test_common.py
index f1ef9262..81e8faa8 100644
--- a/tests/test_common.py
+++ b/tests/test_common.py
@@ -4,8 +4,9 @@ import unittest
 
 from you_get.common import *
 
+
 class TestCommon(unittest.TestCase):
-    
+
     def test_match1(self):
         self.assertEqual(match1('http://youtu.be/1234567890A', r'youtu.be/([^/]+)'), '1234567890A')
         self.assertEqual(match1('http://youtu.be/1234567890A', r'youtu.be/([^/]+)', r'youtu.(\w+)'), ['1234567890A', 'be'])
diff --git a/tests/test_util.py b/tests/test_util.py
index 88743b03..9e1781b9 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -4,6 +4,7 @@ import unittest
 
 from you_get.util.fs import *
 
+
 class TestUtil(unittest.TestCase):
     def test_legitimize(self):
         self.assertEqual(legitimize("1*2", os="linux"), "1*2")
diff --git a/you-get b/you-get
index 8529388f..65c537d3 100755
--- a/you-get
+++ b/you-get
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
-import os, sys
+import os
+import sys
 
 _srcdir = '%s/src/' % os.path.dirname(os.path.realpath(__file__))
 _filepath = os.path.dirname(sys.argv[0])