property函数

property 4个参数, fget、 fset、 fdel、 doc

实际上讲 get  set del 方法绑定在一个成员变量上

class Rectangle(object):
    def __init__(self):
        self.width = 0
        self.height = 0
        
    def setSize(self, size):
        self.width, self.height = size
    
    def getSize(self):
        return self.width, self.height
    
    def delSize(self):
        print('delete')
        del self.width, self.height
    
    size = property(getSize, setSize, delSize, 'Tester')

if __name__ == '__main__':
    rt = Rectangle()
    print(rt.size)
    rt.width = 10
    rt.height = 20
    print(rt.size)
    rt.size = 100, 50
    print(rt.size)
    del rt.size