python带参装饰器

[python]代码库

# 装饰器是一个高阶函数
def copy_properties(src):
    def _copy(dst):

        dst.__name__ = src.__name__
        dst.__doc__ = src.__doc__
        dst.__qualname__ = src.__qualname__
        return dst
    return _copy



def logger(fn):
    @copy_properties(fn)   # @_copy   wrapper = _copy(wrapper)
    def wrapper(*args,**kwargs):

        """this is wrapper"""
        print('before')
        ret = fn(*args,**kwargs)
        print('after')

        return ret

    # copy_properties(fn, wrapper)
    return wrapper






@logger
def add(x,y):
    """
    This is a function of addition

    return int
    x int
    y int
    """

    a = x + y
    return a

print(add.__doc__,add.__name__,add.__qualname__,sep='\n')

# print(help(add))