def is_ready(self, key):
        """Returns true if a result is available for ``key``."""
        if self.pending_callbacks is None or key not in self.pending_callbacks:
            raise UnknownKeyError("key %r is not pending" % (key,))
        return key in self.results
dataset/ETHPy150Open tornadoweb/tornado/tornado/gen.py/Runner.is_ready/original