Issue #27083: Respect the PYTHONCASEOK environment variable under

Windows.

Originally only b'PYTHONCASEOK' was being checked for in os.environ,
but that won't work under Windows where all environment variables are
strings (on OS X they are bytes).

Thanks to Eryk Sun for the bug report.

2 files changed, 11 insertions, 7 deletions

diff --git a/Lib/importlib/_bootstrap_external.py b/Lib/importlib/_bootstrap_external.py
index 08ddb2b..6e2ddb5 100644
--- a/Lib/importlib/_bootstrap_external.py
+++ b/Lib/importlib/_bootstrap_external.py
@@ -29,7 +29,8 @@ def _make_relax_case():
     if sys.platform.startswith(_CASE_INSENSITIVE_PLATFORMS):
         def _relax_case():
             """True if filenames must be checked case-insensitively."""
-            return b'PYTHONCASEOK' in _os.environ
+            return (b'PYTHONCASEOK' in _os.environ
+                    or 'PYTHONCASEOK' in _os.environ)
     else:
         def _relax_case():
             """True if filenames must be checked case-insensitively."""
diff --git a/Lib/test/test_importlib/source/test_case_sensitivity.py b/Lib/test/test_importlib/source/test_case_sensitivity.py
index c274b38..c4bf306 100644
--- a/Lib/test/test_importlib/source/test_case_sensitivity.py
+++ b/Lib/test/test_importlib/source/test_case_sensitivity.py
@@ -39,12 +39,17 @@ class CaseSensitivityTest:
             insensitive_finder = self.finder(insensitive_path)
             return self.find(sensitive_finder), self.find(insensitive_finder)
 
+    def env_changed(self, *, should_exist):
+        possibilities = b'PYTHONCASEOK', 'PYTHONCASEOK'
+        if any(x in self.importlib._bootstrap_external._os.environ
+                   for x in possibilities) == should_exist:
+            self.skipTest('os.environ changes not reflected in '
+                              '_os.environ')
+
     def test_sensitive(self):
         with test_support.EnvironmentVarGuard() as env:
             env.unset('PYTHONCASEOK')
-            if b'PYTHONCASEOK' in self.importlib._bootstrap_external._os.environ:
-                self.skipTest('os.environ changes not reflected in '
-                              '_os.environ')
+            self.env_changed(should_exist=False)
             sensitive, insensitive = self.sensitivity_test()
             self.assertIsNotNone(sensitive)
             self.assertIn(self.name, sensitive.get_filename(self.name))
@@ -53,9 +58,7 @@ class CaseSensitivityTest:
     def test_insensitive(self):
         with test_support.EnvironmentVarGuard() as env:
             env.set('PYTHONCASEOK', '1')
-            if b'PYTHONCASEOK' not in self.importlib._bootstrap_external._os.environ:
-                self.skipTest('os.environ changes not reflected in '
-                              '_os.environ')
+            self.env_changed(should_exist=True)
             sensitive, insensitive = self.sensitivity_test()
             self.assertIsNotNone(sensitive)
             self.assertIn(self.name, sensitive.get_filename(self.name))