在python中触发执行__call__

# __call__
class Rect(object)
    """
    调用实例对象来改变矩形的位置
    """
 
    def __init__(self, x, y):
        # x, y代表矩形坐标
        self.x, self.y = x, y
 
    def __call__(self, x, y):        
        # 改变实体的位置
        self.x, self.y = x, y
 
 
# ipython 测验
In [33]: r = Rect(10, 10)
 
In [34]: r.x, r.y
Out[34]: (10, 10)
 
In [35]: r(0, 0)
 
In [36]: r.x, r.y
Out[36]: (0, 0)
 
In [37]: r(100, 100)
 
In [38]: r.x, r.y
Out[38]: (100, 100)