用装饰器，实现命令分发器。

[python]代码库

def cmds_dispatcher():
    commands = {}
    # 注册
    def reg(name):
        def _reg(fn):
            commands[name] = fn
            return fn
        return _reg

    def defaultfunc():
        print("Unkown command")

    def dispatcher():
        while True:
            cmd = input('>>')
            if cmd.strip() == 'quit':
                return
            commands.get(cmd,defaultfunc)()
    return reg,dispatcher
reg,dispatcher = cmds_dispatcher()
# r,d = cmds_dispatcher()
# 自定义函数 注册
@reg('mag')
def foo1():
    print('welcome magedu')

@reg('py')   #foo2 = reg('py')(foo2)
def foo2():
    print('welcome python')

dispatcher()