def consumer(address,callback,message_type):
return Consumer(address,callback,message_type)<EOL>
Creates a consumer binding to the given address pull messages.
The callback is invoked for every reply received.

    Args:
        - address: the address to bind the PULL socket to.
        - callback: the callback to invoke for every message. Must accept 1 variables - the message
        - message_type: the type of message to receive