[cleanup] linter, code formatting and readme

README.md

@@ -168,7 +168,7 @@ Python versions 3.6+ (CPython and PyPy) are officially supported. Other versions
 
 On windows, [Microsoft Visual C++ 2010 Redistributable Package (x86)](https://www.microsoft.com/en-us/download/details.aspx?id=26999) is also necessary to run yt-dlp. You probably already have this, but if the executable throws an error due to missing `MSVCR100.dll` you need to install it.
 
-Although there are no other required dependencies, `ffmpeg` and `ffprobe` are highly recommended. Other optional dependencies are `sponskrub`, `AtomicParsley`, `mutagen`, `pycryptodome` and any of the supported external downloaders. Note that the windows releases are already built with the python interpreter, mutagen and pycryptodome included.
+Although there are no other required dependencies, `ffmpeg` and `ffprobe` are highly recommended. Other optional dependencies are `sponskrub`, `AtomicParsley`, `mutagen`, `pycryptodome`, `phantomjs` and any of the supported external downloaders. Note that the windows releases are already built with the python interpreter, mutagen and pycryptodome included.
 
 ### UPDATE
 You can use `yt-dlp -U` to update if you are using the provided release.
@@ -818,7 +818,7 @@ You can configure yt-dlp by placing any supported command line option to a confi
     * `~/yt-dlp.conf.txt`
 
     Note that `~` points to `C:\Users\<user name>` on windows. Also, `%XDG_CONFIG_HOME%` defaults to `~/.config` if undefined
-1. **System Configuration**: `/etc/yt-dlp.conf` or `/etc/yt-dlp.conf`
+1. **System Configuration**: `/etc/yt-dlp.conf`
 
 For example, with the following configuration file yt-dlp will always extract the audio, not copy the mtime, use a proxy and save all videos under `YouTube` directory in your home directory:
 ```

yt_dlp/YoutubeDL.py

@@ -1191,8 +1191,8 @@ class YoutubeDL(object):
         elif result_type == 'url':
             # We have to add extra_info to the results because it may be
             # contained in a playlist
-            return self.extract_info(ie_result['url'],
-                                     download,
+            return self.extract_info(
+                ie_result['url'], download,
                 ie_key=ie_result.get('ie_key'),
                 extra_info=extra_info)
         elif result_type == 'url_transparent':
@@ -2136,12 +2136,9 @@ class YoutubeDL(object):
                 self.report_warning('Requested format is not available')
         elif download:
             self.to_screen(
-                '[info] %s: Downloading format(s) %s'
-                % (info_dict['id'], ", ".join([f['format_id'] for f in formats_to_download])))
-            if len(formats_to_download) > 1:
-                self.to_screen(
-                    '[info] %s: Downloading video in %s formats'
-                    % (info_dict['id'], len(formats_to_download)))
+                '[info] %s: Downloading %d format(s): %s' % (
+                    info_dict['id'], len(formats_to_download),
+                    ", ".join([f['format_id'] for f in formats_to_download])))
             for fmt in formats_to_download:
                 new_info = dict(info_dict)
                 new_info.update(fmt)
@@ -2790,13 +2787,9 @@ class YoutubeDL(object):
                     actual_post_extract(video_dict or {})
                 return
 
-            if '__post_extractor' not in info_dict:
-                return
-            post_extractor = info_dict['__post_extractor']
-            if post_extractor:
+            post_extractor = info_dict.get('__post_extractor') or (lambda: {})
             info_dict.update(post_extractor().items())
-            del info_dict['__post_extractor']
-            return
+            info_dict.pop('__post_extractor', None)
 
         actual_post_extract(info_dict or {})
 

yt_dlp/extractor/common.py

@@ -554,6 +554,8 @@ class InfoExtractor(object):
                     self.initialize()
                     self.write_debug('Extracting URL: %s' % url)
                     ie_result = self._real_extract(url)
+                    if ie_result is None:
+                        return None
                     if self._x_forwarded_for_ip:
                         ie_result['__x_forwarded_for_ip'] = self._x_forwarded_for_ip
                     subtitles = ie_result.get('subtitles')

ytdlp_plugins/extractor/__init__.py

@@ -1,2 +1,3 @@
 # flake8: noqa
+
 from .sample import SamplePluginIE

ytdlp_plugins/extractor/sample.py

@@ -1,11 +1,13 @@
+# coding: utf-8
+
 from __future__ import unicode_literals
 
-# Don't use relative imports
+# ⚠ Don't use relative imports
 from yt_dlp.extractor.common import InfoExtractor
 
 
-# See https://github.com/ytdl-org/youtube-dl#adding-support-for-a-new-site
-# for instuctions on making extractors
+# ℹ️ Instructions on making extractors can be found at:
+# 🔗 https://github.com/ytdl-org/youtube-dl#adding-support-for-a-new-site
 
 class SamplePluginIE(InfoExtractor):
     _WORKING = False