Issue #25754: Allow test_rlcompleter to be run multiple times

Lib/test/test_rlcompleter.py

 import unittest
+from unittest.mock import patch
 import builtins
 import rlcompleter
 
@@ -72,7 +73,7 @@ class TestRlcompleter(unittest.TestCase):
         self.assertIn('CompleteMe.__name__', matches)
         self.assertIn('CompleteMe.__new__(', matches)
 
-        CompleteMe.me = CompleteMe
+        with patch.object(CompleteMe, "me", CompleteMe, create=True):
             self.assertEqual(self.completer.attr_matches('CompleteMe.me.me.sp'),
                              ['CompleteMe.me.me.spam'])
             self.assertEqual(self.completer.attr_matches('egg.s'),