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/network/lazy_wheel.py b/src/pip/_internal/network/lazy_wheel.py
index c5176a4bb..fd7ab7f03 100644
--- a/src/pip/_internal/network/lazy_wheel.py
+++ b/src/pip/_internal/network/lazy_wheel.py
@@ -5,15 +5,15 @@ __all__ = ['HTTPRangeRequestUnsupported', 'dist_from_wheel_url']
 from bisect import bisect_left, bisect_right
 from contextlib import contextmanager
 from tempfile import NamedTemporaryFile
+from typing import TYPE_CHECKING
 from zipfile import BadZipfile, ZipFile
 
 from pip._vendor.requests.models import CONTENT_CHUNK_SIZE
 
 from pip._internal.network.utils import HEADERS, raise_for_status, response_chunks
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
 from pip._internal.utils.wheel import pkg_resources_distribution_for_wheel
 
-if MYPY_CHECK_RUNNING:
+if TYPE_CHECKING:
     from typing import Any, Dict, Iterator, List, Optional, Tuple
 
     from pip._vendor.pkg_resources import Distribution