Made my changes compliant to conventions

I used flake8 to make my code compliant to conventions used in the
project, and the community.

youtube_dl/YoutubeDL.py

@@ -113,6 +113,7 @@ from .version import __version__
 if compat_os_name == 'nt':
     import ctypes
 
+
 class YoutubeDL(object):
     """YoutubeDL class.
 
@@ -824,7 +825,7 @@ class YoutubeDL(object):
                 self.report_error(compat_str(e), e.format_traceback())
             except MaxDownloadsReached:
                 raise
-            except Forbidden403 as err:
+            except Forbidden403:
                 # Lets not abuse of this 😜 we don't want to get brutal on the server
                 time.sleep(random.randint(3, 13))
                 wrapper(self, *args, **kwargs)

youtube_dl/__init__.py

@@ -481,5 +481,4 @@ def main(argv=None):
         sys.exit('\nERROR: Interrupted by user')
 
 
-
 __all__ = ['main', 'YoutubeDL', 'gen_extractors', 'list_extractors']

youtube_dl/compat.py

@@ -2997,10 +2997,12 @@ else:
     def compat_ctypes_WINFUNCTYPE(*args, **kwargs):
         return ctypes.WINFUNCTYPE(*args, **kwargs)
 
+
 # Implement an error for which it is raise when error code 403 HTTPError
 class Forbidden403(Exception):
     pass
 
+
 __all__ = [
     'compat_HTMLParseError',
     'compat_HTMLParser',