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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _async_socket(self):
 """ Creates a new async socket if one doesn't already exist for this Client """

        if not self._async_socket_cache:
            self._async_socket_cache = self._connect_to_socket(zmq.asyncio.Context(), self.endpoint)

        return self._async_socket_cache