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Python: I had difficulty understanding what it wants me to do.
It simply wants you to define the methods read_string_from_socket, write_string_to_socket to call the appropriate methods on the socket. The socket is created, bound, etc for you and is passed to you as 'connection'.
The same thing (socket.send(), socket.recv(size)) works in Python 2 but not Python 3 - can someone tell me what has changed?