Python3.x 实现类的继承

定义基类 实现长方形和圆形的继承 实现正方形对长方形的继承
除基类以外 每个类重写构造方法和GetArea()函数，来实现面积的计算和打印数据

if s==int(s):
            print(int(s))
        else:
            print(s)

此代码段实现圆面积整形数据和浮点数据的分别输出

main（）函数实现类的实例化、赋值和调用类方法输出

class shape:
    def _init_(self,x,y):
        self.x=x
        self.y=y

class Rectangle(shape):
    def _init_(self,l,h):
        self.l=l
        self.h=h

    def GetArea(self):
        print(self.h*self.l)


class Circle(shape):
    def _init_(self,r):
        self.r=r

    def GetArea(self):
        s=self.r*self.r*3.14
        if s==int(s):
            print(int(s))
        else:
            print(s)


class Square(Rectangle):
    def _init_(self,d):
        self.d=d

    def GetArea(self):
        print(self.d**2)

def main():
    l,h=map(eval,input().split())
    r=eval(input())
    d=eval(input())
    S1=Rectangle()
    S1.l=l
    S1.h=h
    S1.GetArea()
    S2=Circle()
    S2.r=r
    S2.GetArea()
    S3=Square()
    S3.d=d
    S3.GetArea()
main()