AttributeError

class Point(object):
   def __init__(self, x,y):
       self.x = x
       self.y = y
   def string(self):
       print('X:{0},Y:{1}'.format(self.x,self.y))
class Circle(Point):
   def __init__(self, x, y,radius):
       super().__init__(x,y)
       self.radius = radius
   def string(self):
       print('该图形初始化点为：X:{0},Y:{1}；半径为：{2}'.format(self.x,self.y,self.radius))
class Size(object):
   def __init__(self, width, height):
       self.width = width
       self.height = height
   def string(self):
       print('Width:{0},Height:{1}'.format(self.width,self.height))
class Rectangle(Point,Size):
   def __init__(self, x, y, width, height):
       super().__init__(x,y)
       super().__init__(width, height)
   def string(self):
       print('该图形初始化点为：X:{0},Y:{1}；长宽分别为：Width:{2},Height:{3}'.format(self.x,self.y,self.width,self.height))
if __name__ == '__main__':
   c = Circle(5,5,8)
   c.string()
   r1 = Rectangle(15,15,15,15)
   r1.string()
   r2 = Rectangle(40,30,11,14)
   r2.string()

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Traceback (most recent call last):

  File "C:/Users/Administrator/Desktop/PY/课程/2019-9-14/2-6 编程练习.py", line 29, in <module>

    r1.string()

  File "C:/Users/Administrator/Desktop/PY/课程/2019-9-14/2-6 编程练习.py", line 24, in string

    print('该图形初始化点为：X:{0},Y:{1}；长宽分别为：Width:{2},Height:{3}'.format(self.x,self.y,self.width,self.height))

AttributeError: 'Rectangle' object has no attribute 'width'

该图形初始化点为：X:5,Y:5；半径为：8