for循环体现多态

陈安-26020007005-261067224.py

@@ -2,13 +2,19 @@ class Shape:
     def area(self):
         return 0
 
-class Circle(area):
+class Circle(Shape):
     def __init__(self, r):
         self.r = r
     def area(self):
         return 3.14 * self.r * self.r
-class Square(area):
+class Square(Shape):
     def __init__(self, side):
         self.side = side
     def area(self):
         return self.side * self.side
+
+r = float(input("请输入半径r:"))
+side = float(input("请输入边长side: "))
+shapes = [Circle(r), Square(side)]
+for i in shapes:
+    print(i.__class__.__name__, "面积为:", i.area())