tweak stdlib imports to follow Google style guide

Google Python style guide says to import modules.
Clean up all our stdlib imports.  Leave the repo ones alone
for now as that's a much bigger shave.

Change-Id: Ida42fc2ae78b86e6b7a6cbc98f94ca04b295f8cc
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/383714
Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Mike Frysinger <vapier@google.com>
Tested-by: Mike Frysinger <vapier@google.com>

git_config.py

@@ -15,7 +15,7 @@
 import contextlib
 import datetime
 import errno
-from http.client import HTTPException
+import http.client
 import json
 import os
 import re
@@ -650,7 +650,7 @@ class Remote(object):
                     raise UploadError("%s: %s" % (self.review, str(e)))
                 except urllib.error.URLError as e:
                     raise UploadError("%s: %s" % (self.review, str(e)))
-                except HTTPException as e:
+                except http.client.HTTPException as e:
                     raise UploadError(
                         "%s: %s" % (self.review, e.__class__.__name__)
                     )

release/update_manpages.py

@@ -18,8 +18,8 @@ Most code lives in this module so it can be unittested.
 """
 
 from pathlib import Path
-from functools import partial
 import argparse
+import functools
 import multiprocessing
 import os
 import re
@@ -112,7 +112,9 @@ def main(argv):
 
         # Run all cmd in parallel, and wait for them to finish.
         with multiprocessing.Pool() as pool:
-            pool.map(partial(worker, cwd=tempdir, check=True), cmdlist)
+            pool.map(
+                functools.partial(worker, cwd=tempdir, check=True), cmdlist
+            )
 
     for tmp_path in MANDIR.glob("*.1.tmp"):
         path = tmp_path.parent / tmp_path.stem

repo_trace.py

@@ -20,11 +20,11 @@ Temporary: Tracing is always on. Set `REPO_TRACE=0` to turn off.
 To also include trace outputs in stderr do `repo --trace_to_stderr ...`
 """
 
+import contextlib
 import sys
 import os
 import time
 import tempfile
-from contextlib import ContextDecorator
 
 import platform_utils
 
@@ -68,7 +68,7 @@ def _SetTraceFile(quiet):
     _TRACE_FILE = _GetTraceFile(quiet)
 
 
-class Trace(ContextDecorator):
+class Trace(contextlib.ContextDecorator):
     """Used to capture and save git traces."""
 
     def _time(self):

subcmds/abandon.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from collections import defaultdict
+import collections
 import functools
 import itertools
 import sys
@@ -88,8 +88,8 @@ It is equivalent to "git branch -D <branchname>".
 
     def Execute(self, opt, args):
         nb = args[0].split()
-        err = defaultdict(list)
-        success = defaultdict(list)
+        err = collections.defaultdict(list)
+        success = collections.defaultdict(list)
         aggregate_errors = []
         all_projects = self.GetProjects(
             args[1:], all_manifests=not opt.this_manifest_only

subcmds/selfupdate.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from optparse import SUPPRESS_HELP
+import optparse
 import sys
 
 from command import Command, MirrorSafeCommand
@@ -52,7 +52,7 @@ need to be performed by an end-user.
             "--repo-upgraded",
             dest="repo_upgraded",
             action="store_true",
-            help=SUPPRESS_HELP,
+            help=optparse.SUPPRESS_HELP,
         )
 
     def Execute(self, opt, args):

subcmds/sync.py

@@ -19,7 +19,7 @@ import io
 import json
 import multiprocessing
 import netrc
-from optparse import SUPPRESS_HELP
+import optparse
 import os
 import socket
 import sys
@@ -481,7 +481,7 @@ later is required to fix a server side protocol bug.
             "--repo-upgraded",
             dest="repo_upgraded",
             action="store_true",
-            help=SUPPRESS_HELP,
+            help=optparse.SUPPRESS_HELP,
         )
 
     def _GetBranch(self, manifest_project):

tests/test_repo_logging.py

@@ -14,7 +14,7 @@
 
 """Unit test for repo_logging module."""
 import unittest
-from unittest.mock import MagicMock
+from unittest import mock
 
 from repo_logging import RepoLogger
 
@@ -30,7 +30,7 @@ class TestRepoLogger(unittest.TestCase):
             nonlocal result
             result = log.getMessage()
 
-        mock_out = MagicMock()
+        mock_out = mock.MagicMock()
         mock_out.level = 0
         mock_out.handle = mock_handler
         logger.addHandler(mock_out)
@@ -49,7 +49,7 @@ class TestRepoLogger(unittest.TestCase):
             nonlocal result
             result = log.getMessage()
 
-        mock_out = MagicMock()
+        mock_out = mock.MagicMock()
         mock_out.level = 0
         mock_out.handle = mock_handler
         logger.addHandler(mock_out)
@@ -88,7 +88,7 @@ class TestRepoLogger(unittest.TestCase):
             nonlocal result
             result.append(log.getMessage())
 
-        mock_out = MagicMock()
+        mock_out = mock.MagicMock()
         mock_out.level = 0
         mock_out.handle = mock_handler
         logger.addHandler(mock_out)

tests/test_wrapper.py

@@ -14,7 +14,7 @@
 
 """Unittests for the wrapper.py module."""
 
-from io import StringIO
+import io
 import os
 import re
 import sys
@@ -47,8 +47,10 @@ class RepoWrapperUnitTest(RepoWrapperTestCase):
     def test_version(self):
         """Make sure _Version works."""
         with self.assertRaises(SystemExit) as e:
-            with mock.patch("sys.stdout", new_callable=StringIO) as stdout:
-                with mock.patch("sys.stderr", new_callable=StringIO) as stderr:
+            with mock.patch("sys.stdout", new_callable=io.StringIO) as stdout:
+                with mock.patch(
+                    "sys.stderr", new_callable=io.StringIO
+                ) as stderr:
                     self.wrapper._Version()
         self.assertEqual(0, e.exception.code)
         self.assertEqual("", stderr.getvalue())