register_fuctions.py

_FUNCS = {}


def register(name):
    def wrap(func):
        global _FUNCS
        if name not in _FUNCS:
            _FUNCS[name] = func
        else:
            raise ValueError("name `{}` is already registered!".format(name))

        return func

    return wrap


@register('f1')
def func1(params):
    return params


@register('f2')
def func2(params):
    return params


if __name__ == '__main__':
    print(func1('hello'))
    print(func1('world'))
    print(_FUNCS)