PEP8 fixes

youtube_dl/extractor/common.py

@@ -27,7 +27,6 @@ from ..utils import (
     compiled_regex_type,
     ExtractorError,
     float_or_none,
-    HEADRequest,
     int_or_none,
     RegexNotFoundError,
     sanitize_filename,

youtube_dl/extractor/twitch.py

@@ -348,6 +348,7 @@ class TwitchStreamIE(TwitchBaseIE):
             '%s/api/channel/hls/%s.m3u8?%s'
             % (self._USHER_BASE, channel_id, compat_urllib_parse.urlencode(query).encode('utf-8')),
             channel_id, 'mp4')
+
         # prefer the 'source' stream, the others are limited to 30 fps
         def _sort_source(f):
             if f.get('m3u8_media') is not None and f['m3u8_media'].get('NAME') == 'Source':

youtube_dl/extractor/videolecturesnet.py

@@ -52,7 +52,7 @@ class VideoLecturesNetIE(InfoExtractor):
         formats = []
         for v in switch.findall('./video'):
             proto = v.attrib.get('proto')
-            if not proto in ['http', 'rtmp']:
+            if proto not in ['http', 'rtmp']:
                 continue
             f = {
                 'width': int_or_none(v.attrib.get('width')),