Replace pip._internal.utils.typing with stdlib typing

The stdlib module has been available since Python 3.5 and the
TYPE_CHECKING constant has been available since 3.5.2.

By using stdlib, this removes the need for pip to maintain its own
Python 2 typing compatibility shim.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/pip/_internal/operations/prepare.py b/src/pip/_internal/operations/prepare.py
index 715c3debd..e09fa7fb0 100644
--- a/src/pip/_internal/operations/prepare.py
+++ b/src/pip/_internal/operations/prepare.py
@@ -8,6 +8,7 @@ import logging
 import mimetypes
 import os
 import shutil
+from typing import TYPE_CHECKING
 
 from pip._vendor.packaging.utils import canonicalize_name
 
@@ -33,11 +34,10 @@ from pip._internal.utils.hashes import MissingHashes
 from pip._internal.utils.logging import indent_log
 from pip._internal.utils.misc import display_path, hide_url, path_to_display, rmtree
 from pip._internal.utils.temp_dir import TempDirectory
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
 from pip._internal.utils.unpacking import unpack_file
 from pip._internal.vcs import vcs
 
-if MYPY_CHECK_RUNNING:
+if TYPE_CHECKING:
     from typing import Dict, Iterable, List, Optional, Tuple
 
     from pip._vendor.pkg_resources import Distribution