gistfile1.py

class ReadAction(Action):
    def __init__(self, name):
        super().__init__()
        self.name = name

    def run(self, socket, vars):
        data = socket.recv(MAGIC_CONSTANT)
        vars[self.name] = data

class WriteAction(Action):
    def __init__(self, data):
        super().__init__()
        self.data = data

    def run(self, socket, vars):
        if isinstance(self.data, str):
            to_send = self.data
        else:
            to_send = self.data(vars)
        socket.send(to_send)