decorator for api

#!/usr/bin/env python3


all_commands = {} # dict: name => func

def command(func):
    all_commands[func.__name__] = func
    return func

@command
def hello(name):
    return "Hello, %s" % name

@command
def sum_numbers(a, b):
    return str(int(a) + int(b))

class Server:
    def run(self):
        while True:
            command, *args = input().split()
            try:
                print(all_commands[command](*args))
            except KeyError:
                command_list = '\n'.join(all_commands.keys())
                print("Unknown command, avaible commands:\n" + command_list)

Server().run()