# -*- coding: utf-8 -*-

"""
@author: mo
@contact: 
@file: object_hw.py
@time: 7/9/2021 9:18 PM
"""


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

    def speak(self):
        print('Hello! I am %s' % self.name)

    def relation(self):
        pass


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

    def speak(self):
        print(f'My student ID is {self.__stu_num}, greetings everyone!')

    def identify_stu(self):
        if (self._Student__stu_num == '2018014002'):
            print('The group of the student has been assigned')
        else:
            print('Assigning group for the student')

    def set_num(self, new_num):
        self.__stu_num = new_num

    def relation(self):
        if issubclass(Student, Person):
            print('''My parent class is 'Parent' ''')
        else:
            print('Searching the super class...')


if __name__ == '__main__':
    stu = Student('Mo', 'male', 90, 'Mathematics')
    # 调用speak方法 打印stu对应的值
    stu.speak()
    # 调用实例方法 鉴别学号是否为指定值
    stu.identify_stu()
    # 调用实例方法 鉴别实例对象所属的类的父类是否为Person
    stu.relation()

    print("******************")
    stu_2 = Student('小红', '女', 89, '英语')
    # 调用实例方法 设置stu_2的学号为'2018040625'
    stu_2.set_num('2018040625')

    # 调用实例方法 打印stu_2对应的值
    stu_2.speak()
    # 调用实例方法 鉴别学号是否为指定值
    stu_2.identify_stu()

    # check whether the super class is 'Person'
    stu_2.relation()

​