dispatcher.py

#!/usr/bin/env python3

_HANDLERS = {}


def handle(key):
    def wrapper(func):
        _HANDLERS[key] = func
    return wrapper


@handle('!say')
def on_say(text):
    print(text)


@handle('!ping')
def on_ping(text):
    print('Pong!')


if __name__ == "__main__":
    while True:
        payload = input('>> ')
        if payload == '!exit':
            break

        if payload.startswith('!'):
            cmd, *args = payload.split(' ')
            if cmd in _HANDLERS:
                _HANDLERS[cmd](' '.join(args))