class Shape:
 def draw(self):
  print("绘制图形")

class Circle(Shape):
 def draw(self):
  print("绘制圆形")

class Rectangle(Shape):
 def draw(self):
  print("绘制矩形")

if __name__ == "__main__":
 s1 = Circle()
 s2 = Rectangle()

 s1.draw()
 s2.draw()