From 137ab9d684075f772c322f455b0dd1f992ddcd8f Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Mon, 20 Dec 2021 19:46:08 -0500
Subject: Avoid KeyError in distutils hack when pip is imported during
 ensurepip. Fixes #2940.

---
 _distutils_hack/__init__.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to '_distutils_hack')

diff --git a/_distutils_hack/__init__.py b/_distutils_hack/__init__.py
index da51b433..22bc9ed6 100644
--- a/_distutils_hack/__init__.py
+++ b/_distutils_hack/__init__.py
@@ -119,7 +119,11 @@ class DistutilsMetaFinder:
 
     @staticmethod
     def frame_file_is_setup(frame):
-        return frame.f_globals['__file__'].endswith('setup.py')
+        """
+        Return True if the indicated frame suggests a setup.py file.
+        """
+        # some frames may not have __file__ (#2940)
+        return frame.f_globals.get('__file__', '').endswith('setup.py')
 
 
 DISTUTILS_FINDER = DistutilsMetaFinder()
-- 
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