Python style fixes + unused imports removal in git cl and friends.

R=sergiyb@chromium.org
BUG=

Change-Id: I9b886100557bf6efa9be07d40175f7bb919f5294
Reviewed-on: https://chromium-review.googlesource.com/432456
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>

gerrit_util.py

@@ -17,7 +17,6 @@ import logging
 import netrc
 import os
 import re
-import shutil
 import socket
 import stat
 import sys
@@ -38,7 +37,6 @@ TRY_LIMIT = 5
 GERRIT_PROTOCOL = 'https'
 
 
-
 class GerritError(Exception):
   """Exception class for errors commuicating with the gerrit-on-borg service."""
   def __init__(self, http_status, *args, **kwargs):
@@ -200,6 +198,7 @@ class CookiesAuthenticator(Authenticator):
       return 'Basic %s' % (base64.b64encode('%s:%s' % (auth[0], auth[2])))
     return None
 
+
 # Backwards compatibility just in case somebody imports this outside of
 # depot_tools.
 NetrcAuthenticator = CookiesAuthenticator
@@ -255,7 +254,6 @@ class GceAuthenticator(Authenticator):
       if resp.status < httplib.INTERNAL_SERVER_ERROR:
         return resp
 
-
   @classmethod
   def _get_token_dict(cls):
     if cls._token_cache:
@@ -277,7 +275,6 @@ class GceAuthenticator(Authenticator):
     return '%(token_type)s %(access_token)s' % token_dict
 
 
-
 def CreateHttpConn(host, path, reqtype='GET', headers=None, body=None):
   """Opens an https connection to a gerrit service, and sends a request."""
   headers = headers or {}

git_cl.py

@@ -25,7 +25,6 @@ import re
 import stat
 import sys
 import textwrap
-import traceback
 import urllib
 import urllib2
 import urlparse
@@ -44,7 +43,6 @@ from third_party import upload
 import auth
 import checkout
 import clang_format
-import commit_queue
 import dart_format
 import setup_color
 import fix_encoding
@@ -2007,7 +2005,6 @@ class _RietveldChangelistImpl(_ChangelistCodereviewBase):
       assert new_state == _CQState.DRY_RUN
       self.SetFlags({'commit': '1', 'cq_dry_run': '1'})
 
-
   def CMDPatchWithParsedIssue(self, parsed_issue_arg, reject, nocommit,
                               directory):
     # PatchIssue should never be called with a dirty tree.  It is up to the
@@ -2209,6 +2206,7 @@ class _RietveldChangelistImpl(_ChangelistCodereviewBase):
     self.SetPatchset(patchset)
     return 0
 
+
 class _GerritChangelistImpl(_ChangelistCodereviewBase):
   def __init__(self, changelist, auth_config=None):
     # auth_config is Rietveld thing, kept here to preserve interface only.
@@ -3330,7 +3328,6 @@ def DownloadGerritHook(force):
                    'chmod +x .git/hooks/commit-msg' % src)
 
 
-
 def GetRietveldCodereviewSettingsInteractively():
   """Prompt the user for settings."""
   server = settings.GetDefaultServerUrl(error_ok=True)
@@ -3367,6 +3364,7 @@ def GetRietveldCodereviewSettingsInteractively():
   SetProperty(settings.GetRunPostUploadHook(), 'Run Post Upload Hook',
               'run-post-upload-hook', False)
 
+
 @subcommand.usage('[repo root containing codereview.settings]')
 def CMDconfig(parser, args):
   """Edits configuration for this tree."""
@@ -4578,7 +4576,7 @@ def CMDpatch(parser, args):
       parser.error('current branch must have an associated issue')
 
     upstream = cl.GetUpstreamBranch()
-    if upstream == None:
+    if upstream is None:
       parser.error('No upstream branch specified. Cannot reset branch')
 
     RunGit(['reset', '--hard', upstream])
@@ -5000,10 +4998,12 @@ def BuildGitDiffCmd(diff_type, upstream_commit, args):
 
   return diff_cmd
 
+
 def MatchingFileType(file_name, extensions):
   """Returns true if the file name ends with one of the given extensions."""
   return bool([ext for ext in extensions if file_name.lower().endswith(ext)])
 
+
 @subcommand.usage('[files or directories to diff]')
 def CMDformat(parser, args):
   """Runs auto-formatting tools (clang-format etc.) on the diff."""

git_footers.py

@@ -83,6 +83,7 @@ def add_footer_change_id(message, change_id):
   return add_footer(message, 'Change-Id', change_id,
                     after_keys=['Bug', 'Issue', 'Test', 'Feature'])
 
+
 def add_footer(message, key, value, after_keys=None):
   """Returns a message with given footer appended.
 
@@ -163,7 +164,6 @@ def main(args):
   g.add_argument('--position-num', action='store_true')
   g.add_argument('--json', help="filename to dump JSON serialized headers to.")
 
-
   opts = parser.parse_args(args)
 
   if opts.ref:

tests/git_cl_test.py

@@ -703,7 +703,7 @@ class TestGitCl(TestCase):
         '--cc', ','.join(['joe@example.com'] + cc),
     ] + (['--private'] if private else []) + [
         '--git_similarity', similarity or '50'
-    ] + (['--git_no_find_copies'] if find_copies == False else []) + [
+    ] + (['--git_no_find_copies'] if find_copies is False else []) + [
         'fake_ancestor_sha', 'HEAD'
     ]