ENH: Warn on unsupported Python 3.9+

1 files changed, 8 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 1f5212676..b4c06c402 100755
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@ import os
 import sys
 import subprocess
 import textwrap
-import sysconfig
+import warnings
 
 
 if sys.version_info[:2] < (3, 6):
@@ -59,6 +59,13 @@ MICRO               = 0
 ISRELEASED          = False
 VERSION             = '%d.%d.%d' % (MAJOR, MINOR, MICRO)
 
+if sys.version_info >= (3, 9):
+    warnings.warn(
+        f"NumPy {VERSION} does not support Python "
+        f"{sys.version_info.major}.{sys.version_info.minor}.",
+        RuntimeWarning,
+    )
+
 
 # Return the git revision as a string
 def git_version():