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注册器机制的引入是为了使工程的扩展性变得更好。当产品增加某个功能需要增加一些新函数或者类时，它可以保证我们可以复用之前的逻辑。

我们来看一下它的使用方法：

register_obj = RegisterMachine("register")

# decorate method

@register_obj.register()

def say_hello_with(name):

print("Hello, {person}!".format(person=name))

def say_hi_with(name):

print("Hi, {person}!".format(person=name))

register_obj.get("say_hello_with")("Peter")

# function call method

register_obj.register(say_hi_with)

register_obj.get("say_hi_with")("John")

从上面的例子我们可以看出，我们通过register_obj这个对象，通过传入对应的函数名来得到该函数。接下来介绍下具体的实现：

class RegisterMachine(object):

def __init__(self, name):

# name of register

self._name = name

self._name_method_map = dict()

def register(self, obj=None):

# obj == None for function call register

# otherwise for decorator way

if obj != None:

name = obj.__name__

self._name_method_map[name] = obj

else:

def wrapper(func):

name = func.__name__

self._name_method_map[name] = func

return func

return wrapper

def get(self, name):

return self._name_method_map[name]

if __name__ == "__main__":

register_obj = RegisterMachine("register")

# decorate method

@register_obj.register()

def say_hello_with(name):

print("Hello, {person}!".format(person=name))

def say_hi_with(name):

print("Hi, {person}!".format(person=name))

register_obj.get("say_hello_with")("Peter")

# function call method

register_obj.register(say_hi_with)

register_obj.get("say_hi_with")("John")