Sort imports with isort

Keep imports alphabetically sorted and their order homogeneous across
Python source files.

The isort project has more feature and is more active than the
flake8-import-order plugin.

Most issues caught were simply import ordering from the same module.
Where imports were purposefully placed out of order, tag with
isort:skip.

1 files changed, 3 insertions, 4 deletions

diff --git a/sphinx/config.py b/sphinx/config.py
index 353268e38..b3cd1dc6d 100644
--- a/sphinx/config.py
+++ b/sphinx/config.py
@@ -13,10 +13,9 @@ import traceback
 import types
 import warnings
 from collections import OrderedDict
-from os import path, getenv
-from typing import (
-    Any, Callable, Dict, Generator, Iterator, List, NamedTuple, Set, Tuple, Union
-)
+from os import getenv, path
+from typing import (Any, Callable, Dict, Generator, Iterator, List, NamedTuple, Set, Tuple,
+                    Union)
 
 from sphinx.deprecation import RemovedInSphinx40Warning
 from sphinx.errors import ConfigError, ExtensionError