Python AttributeError:Rectangle实例没有属性'；y'；

我正在编写一个程序，其中用户绘制一个矩形，然后计算周长和面积。在查找两侧的长度时，我得到了一个

AttributeError:Rectangle实例没有属性“y”

以下是我目前的代码：

from graphics import*

win=GraphWin('Rectangle',800,800)

def twopoints():
    pRight=win.getMouse()
    pRight.draw(win)
    pLeft=win.getMouse()
    pLeft.draw(win)
    print (pLeft)
    print (pRight)

    rec=Rectangle(pRight,pLeft)
    rec.draw(win)
    rec.setFill('red')
    return pRight, pLeft, rec

p1=Point(400, 100) 
m=Text(p1,"Click two places on the screen to create a rectangle")
m2=Text(Point(400, 150), "Your first click will be the upper right corner")
m3=Text(Point(400, 200), "Your second click will be the bottom left corner")
m.draw(win)
m2.draw(win)
m3.draw(win)

rec, pRight, pLeft=twopoints()

m.setText("Click to get either the area or perimeter")
m2.undraw()
m3.undraw()

side1=abs(pLeft.y-pRight.y)
side2=abs(pLeft.x-pRight.x)
print (side1)

---

返回多件物品的顺序很重要。给你

return pRight, pLeft, rec

然后把它分配给

rec, pRight, pLeft=twopoints()

Python在这里不按名称匹配，只按顺序匹配，因此

pLeft

外部实际上与

rec

内部相同