Fix some typos and linter

yt_dlp/YoutubeDL.py

@@ -2591,7 +2591,7 @@ class YoutubeDL(object):
         def actual_post_extract(info_dict):
             if info_dict.get('_type') in ('playlist', 'multi_video'):
                 for video_dict in info_dict.get('entries', {}):
-                    actual_post_extract(video_dict)
+                    actual_post_extract(video_dict or {})
                 return
 
             if '__post_extractor' not in info_dict:
@@ -2602,7 +2602,7 @@ class YoutubeDL(object):
             del info_dict['__post_extractor']
             return
 
-        actual_post_extract(info_dict)
+        actual_post_extract(info_dict or {})
 
     def pre_process(self, ie_info):
         info = dict(ie_info)

yt_dlp/extractor/common.py

@@ -1398,7 +1398,7 @@ class InfoExtractor(object):
         return self._hidden_inputs(form)
 
     class FormatSort:
-        regex = r' *((?P<reverse>\+)?(?P<field>[a-zA-Z0-9_]+)((?P<seperator>[~:])(?P<limit>.*?))?)? *$'
+        regex = r' *((?P<reverse>\+)?(?P<field>[a-zA-Z0-9_]+)((?P<separator>[~:])(?P<limit>.*?))?)? *$'
 
         default = ('hidden', 'hasvid', 'ie_pref', 'lang', 'quality',
                    'res', 'fps', 'codec:vp9.2', 'size', 'br', 'asr',
@@ -1558,7 +1558,7 @@ class InfoExtractor(object):
                 if self._get_field_setting(field, 'type') == 'alias':
                     field = self._get_field_setting(field, 'field')
                 reverse = match.group('reverse') is not None
-                closest = match.group('seperator') == '~'
+                closest = match.group('separator') == '~'
                 limit_text = match.group('limit')
 
                 has_limit = limit_text is not None

yt_dlp/extractor/youtube.py

@@ -15,7 +15,6 @@ from .common import InfoExtractor, SearchInfoExtractor
 from ..compat import (
     compat_chr,
     compat_HTTPError,
-    compat_kwargs,
     compat_parse_qs,
     compat_str,
     compat_urllib_parse_unquote_plus,

yt_dlp/options.py

@@ -1148,7 +1148,7 @@ def parseOpts(overrideArguments=None):
         help=(
             'Parse additional metadata like title/artist from other fields. '
             'Give a template or field name to extract data from and the '
-            'format to interpret it as, seperated by a ":". '
+            'format to interpret it as, separated by a ":". '
             'Either regular expression with named capture groups or a '
             'similar syntax to the output template can be used for the FORMAT. '
             'Similarly, the syntax for output template can be used for FIELD '