<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def push(self):
 """ Returns a callable that can be used to transmit a message in a push-pull fashion. Note that the sender function has a ``print`` like signature, with an infinite number of arguments. Each one being a part of the complete message. :rtype: function """

        sock = self.__sock(zmq.PUSH)
        return self.__send_function(sock)