ENH: Add a global constant to `numpy.typing` denoting whether or not `typing_extensions` is available

1 files changed, 5 insertions, 4 deletions

diff --git a/numpy/typing/_shape.py b/numpy/typing/_shape.py
index b720c3ffc..0742be8a9 100644
--- a/numpy/typing/_shape.py
+++ b/numpy/typing/_shape.py
@@ -1,13 +1,14 @@
 import sys
 from typing import Sequence, Tuple, Union
 
+from . import _HAS_TYPING_EXTENSIONS
+
 if sys.version_info >= (3, 8):
     from typing import SupportsIndex
+elif _HAS_TYPING_EXTENSIONS:
+    from typing_extensions import SupportsIndex
 else:
-    try:
-        from typing_extensions import SupportsIndex
-    except ImportError:
-        SupportsIndex = NotImplemented
+    SupportsIndex = NotImplemented
 
 _Shape = Tuple[int, ...]