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

    def speak(self):
        print('hello ! 我是{}'.format(self.name))

    def relation(self):
        pass

class Student(Person):
    def __init__(self,name,gender,score,major):
        Person.__init__(self,name,gender)
        self.score=score
        self.major=major
        self.__stu_num='2018014002'

    def speat(self):
        print('我的学号为{},很高兴认识大家'.format(self.__stu_num))

    def identify_stu(self):
        if self.__stu_num=='2018014002':
            print('我的分组已经完成')

        else:
            print('请稍后，马上为你自动分组')



    def relation(self):
        if isinstance(Student,Person):
            print('我的父类是Person')
        else:
            print('正在查询中')

if __name__=='__main__':
    stu=Student('小明','男',90,'数学')
    result=stu.speak()
    print(stu.speat())
    print(result)
    print(stu.identify_stu())
    print(stu.relation())