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, 2 insertions, 2 deletions

diff --git a/sphinx/util/nodes.py b/sphinx/util/nodes.py
index b4d796f61..05e9cb7b2 100644
--- a/sphinx/util/nodes.py
+++ b/sphinx/util/nodes.py
@@ -11,8 +11,7 @@
 import re
 import unicodedata
 import warnings
-from typing import Any, Callable, Iterable, List, Set, Tuple
-from typing import cast
+from typing import Any, Callable, Iterable, List, Set, Tuple, cast
 
 from docutils import nodes
 from docutils.nodes import Element, Node
@@ -28,6 +27,7 @@ from sphinx.util import logging
 if False:
     # For type annotation
     from typing import Type  # for python3.5.1
+
     from sphinx.builders import Builder
     from sphinx.domain import IndexEntry
     from sphinx.environment import BuildEnvironment