1、父类（学生）：姓名、学号、成绩（考勤、作业、答辩），修改成绩、查看成绩 2、人工智能的学生：专业、科目，查看父类属性（姓名、学号、成绩） 2、大数据的学生：专业、科目，查看父类属性（姓名、学号、成绩，通过特殊字符分隔开）

以下是代码实现：

class Student:
    def __init__(self, name, id, attend_score, homework_score, defense_score):
        self.name = name
        self.id = id
        self.attend_score = attend_score
        self.homework_score = homework_score
        self.defense_score = defense_score
    
    def modify_score(self, item, score):
        if item == 'attend':
            self.attend_score = score
        elif item == 'homework':
            self.homework_score = score
        elif item == 'defense':
            self.defense_score = score
        else:
            print('Invalid item')
    
    def check_score(self):
        print('Name: ', self.name)
        print('ID: ', self.id)
        print('Attend score: ', self.attend_score)
        print('Homework score: ', self.homework_score)
        print('Defense score: ', self.defense_score)


class AIStudent(Student):
    def __init__(self, name, id, attend_score, homework_score, defense_score, major, subject):
        super().__init__(name, id, attend_score, homework_score, defense_score)
        self.major = major
        self.subject = subject
    
    def check_score(self):
        super().check_score()
        print('Major: ', self.major)
        print('Subject: ', self.subject)


class BigDataStudent(Student):
    def __init__(self, name, id, attend_score, homework_score, defense_score, major, subject):
        super().__init__(name, id, attend_score, homework_score, defense_score)
        self.major = major
        self.subject = subject
    
    def check_score(self):
        super().check_score()
        print('Major: ', self.major)
        print('Subject: ', self.subject)
        print('Score string: ', self.name + '|' + self.id + '|' + str(self.attend_score) + '|' + str(self.homework_score) + '|' + str(self.defense_score))

# 示例使用
ai_student = AIStudent('Alice', '001', 90, 80, 95, 'Artificial Intelligence', 'Deep Learning')
ai_student.check_score()

bigdata_student = BigDataStudent('Bob', '002', 85, 95, 90, 'Big Data', 'Data Mining')
bigdata_student.check_score()

运行结果：

Name:  Alice
ID:  001
Attend score:  90
Homework score:  80
Defense score:  95
Major:  Artificial Intelligence
Subject:  Deep Learning

Name:  Bob
ID:  002
Attend score:  85
Homework score:  95
Defense score:  90
Major:  Big Data
Subject:  Data Mining
Score string:  Bob|002|85|95|90