9_2类的继承和多态

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1.类的继承：1>在子类的（）中添加父类；2>在__init__函数中，用super(类，self).__init__方法继承父类的属性。
2.子类新增属性，跟平常的新增一致。
3.类的多态：重写父类发方法

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#父类
class persion():

    def __init__(self,name,gender):
        self.name=name
        self.gender=gender

    def judge(self):
        if self.gender=="男":
            print (self.name + "的性别是：男孩")
        else:
            print (self.name + "的性别是：女孩")

#继承并添加新的属性
class student(persion):

    def __init__(self,name,gender,score):
        super(student,self).__init__(name, gender)
        self.score=score

#类的多态：重写父类发方法
class studentScore(persion):

    def __init__(self,name,gender,score):
        super(studentScore, self).__init__(name,gender)
        self.score=score

    def judge(self):
        if self.score>=90:
            print (self.name+"的成绩结果是：优秀")
        else:
            print (self.name+"的成绩结果是：良好")

if __name__=="__main__":
    #实例化父类
    a=persion("小名","男")
    a.judge()

    #实例化继承
    b=student("小绿","女",92)
    b.judge()

    **#类的多态**
    b=studentScore("小绿","女",85)
    b.judge()