def test_proxyName(self):
        """
        The name of a proxy class indicates which interface it proxies.
        """
        proxy = proxyForInterface(IProxiedInterface)
        self.assertEqual(
            proxy.__name__,
            "(Proxy for "
            "twisted.python.test.test_components.IProxiedInterface)")

        The name of a proxy class indicates which interface it proxies.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/test/test_components.py