test_types_extras.py 文件源码

def test_none_fast_path(self):
        # the None adapter is not actually invoked in regular adaptation

        class WonkyAdapter(object):
            def __init__(self, obj):
                pass

            def getquoted(self):
                return "NOPE!"

        curs = self.conn.cursor()

        orig_adapter = ext.adapters[type(None), ext.ISQLQuote]
        try:
            ext.register_adapter(type(None), WonkyAdapter)
            self.assertEqual(ext.adapt(None).getquoted(), "NOPE!")

            s = curs.mogrify("SELECT %s;", (None,))
            self.assertEqual(b"SELECT NULL;", s)

        finally:
            ext.register_adapter(type(None), orig_adapter)