python 装饰器

了解装饰器之前请深入了解闭包。

class Coordinate(object):
    '''
    坐标(x,y)
    '''
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __repr__(self):
        return "coord: " + str(self.__dict__)

#func = wrapper(func)
def wrapper(func):
    def check(a,b):
        res = func(a, b)
        res = Coordinate(res.x if res.x >0 else 0,res.y if res.y > 0 else 0)
        return res
    return check

@wrapper
def addd(a, b):
    return Coordinate(a.x +b.x, a.y +b.y)

@wrapper
def subb(a, b):
    return Coordinate(a.x -b.x, a.y-b.y)