def test_escape(self):
        """
        Backslash can be used to escape colons and backslashes in port
        descriptions.
        """
        self.assertEqual(
            self.parse('unix:foo\x5c:bar\x5c=baz\x5c:qux\x5c\x5c', self.f),
            ('UNIX', ('foo:bar=baz:qux\x5c', self.f),
             {'mode': 0o666, 'backlog': 50, 'wantPID': True}))

        Backslash can be used to escape colons and backslashes in port
        descriptions.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/test/test_endpoints.py