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/metadata/pkg_resources.py b/src/pip/_internal/metadata/pkg_resources.py
index 48d959a37..ccc3cc57b 100644
--- a/src/pip/_internal/metadata/pkg_resources.py
+++ b/src/pip/_internal/metadata/pkg_resources.py
@@ -1,16 +1,16 @@
 import zipfile
+from typing import TYPE_CHECKING
 
 from pip._vendor import pkg_resources
 from pip._vendor.packaging.utils import canonicalize_name
 
 from pip._internal.utils import misc  # TODO: Move definition here.
 from pip._internal.utils.packaging import get_installer
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
 from pip._internal.utils.wheel import pkg_resources_distribution_for_wheel
 
 from .base import BaseDistribution, BaseEnvironment
 
-if MYPY_CHECK_RUNNING:
+if TYPE_CHECKING:
     from typing import Iterator, List, Optional
 
     from pip._vendor.packaging.version import _BaseVersion