类和对象

 1 class Rectangle:
 2     length = 5
 3     width = 4
 4 
 5     def getRect(self):
 6         print(‘矩形的长是：%.2f，宽是：%.2f‘%(self.length, self.width))
 7 
 8     def setRect(self):
 9         print ‘请输入长和宽‘
10         self.length = float(input(‘长：‘))
11         self.width = float(input(‘宽：‘))
12 
13     def getArea(self):
14         print(‘矩形的面积是：%.2f‘%(self.length*self.width))
15 
16 rect = Rectangle()