BLD: remove __NUMPY_SETUP__ from builtins at end of setup.py

May help reduce the occurrence of gh-2434.

1 files changed, 5 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index 8b8863255..3f4ccfb14 100755
--- a/setup.py
+++ b/setup.py
@@ -388,3 +388,8 @@ def setup_package():
 
 if __name__ == '__main__':
     setup_package()
+    # This may avoid problems where numpy is installed via ``*_requires`` by
+    # setuptools, the global namespace isn't reset properly, and then numpy is
+    # imported later (which will then fail to load numpy extension modules).
+    # See gh-7956 for details
+    del builtins.__NUMPY_SETUP__