Issue #20097: Fix bad use of "self" in importlib's WindowsRegistryFinder.

Lib/importlib/_bootstrap.py

@@ -1406,7 +1406,7 @@ class WindowsRegistryFinder:
     @classmethod
     def find_module(cls, fullname, path=None):
         """Find module named in the registry."""
-        spec = self.find_spec(fullname, path)
+        spec = cls.find_spec(fullname, path)
         if spec is not None:
             return spec.loader
         else:

Lib/test/test_importlib/test_windows.py

@@ -0,0 +1,29 @@
+from . import util
+frozen_machinery, source_machinery = util.import_importlib('importlib.machinery')
+
+import sys
+import unittest
+
+
+@unittest.skipUnless(sys.platform.startswith('win'), 'requires Windows')
+class WindowsRegistryFinderTests:
+
+    # XXX Need a test that finds the spec via the registry.
+
+    def test_find_spec_missing(self):
+        spec = self.machinery.WindowsRegistryFinder.find_spec('spam')
+        self.assertIs(spec, None)
+
+    def test_find_module_missing(self):
+        loader = self.machinery.WindowsRegistryFinder.find_module('spam')
+        self.assertIs(loader, None)
+
+
+class Frozen_WindowsRegistryFinderTests(WindowsRegistryFinderTests,
+                                        unittest.TestCase):
+    machinery = frozen_machinery
+
+
+class Source_WindowsRegistryFinderTests(WindowsRegistryFinderTests,
+                                        unittest.TestCase):
+    machinery = source_machinery

Misc/NEWS

@@ -36,6 +36,8 @@ Core and Builtins
 - Issue #19736: Add module-level statvfs constants defined for GNU/glibc
   based systems.
 
+- Issue #20097: Fix bad use of "self" in importlib's WindowsRegistryFinder.
+
 - Issue #19729: In str.format(), fix recursive expansion in format spec.
 
 - Issue #19638: Fix possible crash / undefined behaviour from huge (more than 2