@trollius.coroutine
    def slowsquare(self, x):
        if x is not 5:
            raise Exception("number too large")
        else:
            yield trollius.sleep(1)
            raise trollius.Return(x * x)
dataset/ETHPy150Open crossbario/autobahn-python/examples/asyncio/websocket/slowsquare/server_py2.py/SlowSquareServerProtocol.slowsquare/operator `>` -> `is not`