File test_cmdline.py.diff of Package powerline

--- a/tests/test_python/test_cmdline.py.smb	2025-03-11 14:21:02.257662814 -0400
+++ b/tests/test_python/test_cmdline.py	2025-03-11 14:21:37.016866644 -0400
@@ -52,7 +52,7 @@
 			]:
 				self.assertRaises(SystemExit, parser.parse_args, raising_args)
 				self.assertFalse(out.getvalue())
-				self.assertRegexpMatches(err.getvalue(), raising_reg)
+				self.assertRegex(err.getvalue(), raising_reg)
 				flush()
 
 	def test_main_normal(self):