Python基础课：类的特殊方法

class Rectangle:
    '这是一个矩形类'
    def __init__(self,length,width):
        if isinstance(length,(int,float)) and isinstance(width,(int,float)):
            self.length = length
            self.width  = width
        else:
            raise TypeError
            #return None
    def area(self):
        areas = self.length * self.width
        return areas
 
    def __str__(self):
        return '宽为%s,高为%s'%(self.width,self.length)
    def __repr__(self):
        return '面积为:%s'%(self.area())
    def __call__(self):
        return '这是一个call方法'
    def __add__(self,other):
        add_length = self.length + other.length
        add_width = self.width + other.width
        return add_length,add_width
 
b = Rectangle(3,5)
b.__dict__
b.__doc__
 
#print(b)
b
 
c = Rectangle(4,6)