python装饰器4【两个参数】【wraps】【不常规套路】

1. 代码

#  wraps的参数是原来的函数，修饰返回的函数

def _implicit_lookup(self, subroutine, arg_name):  # feed 里面查找 animal

    replacer = ArgumentReplacer(subroutine, arg_name)

    @wraps(subroutine)  # 换汤不换药，不认识了subroutine
    def lookup_closure(*args, **kwargs):
        with replacer.replace_and_call(args, kwargs) as replaced:    # 【注意】不是*args, **kwargs
            if self._should_be_replaced(replaced.value):
                self._lookup_in_store_and_replace_argument(replaced)
        return replaced.returned_value
    return lookup_closure

2. 对比

def a_new_decorator(a_func):
    
    @wraps(a_func)
    def wrapTheFunction(*args, **kwargs):
        print("I am doing some boring work before executing a_func()")

        a_func(*args, **kwargs)   # 【注意】不是 a_func(args, kwargs)
 
        print("I am doing some boring work after executing a_func()")
 
    return wrapTheFunction