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

@@ -2997,9 +2997,11 @@ 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
+    pass
+
 
 __all__ = [
     'compat_HTMLParseError',

youtube_dl/downloader/http.py

@@ -187,7 +187,7 @@ class HttpFD(FileDownloader):
                 elif err.code != 403 and (err.code < 500 or err.code >= 600):
                     # Unexpected HTTP error
                     raise
-                elif err.code == 403: # The famous 403 Forbidden error
+                elif err.code == 403:  # The famous 403 Forbidden error
                     raise Forbidden403
                 raise RetryDownload(err)
             except socket.error as err: