class Student:
    # 构造方法，用于初始化对象的属性
    def __init__(self, name, age, grade):
        self.name = name
        self.age = age
        self.grade = grade

    # 方法用于获取学生信息
    def get_student_info(self):
        return f"Name: {self.name}, Age: {self.age}, Grade: {self.grade}"

    # 方法用于学生学习
    def study(self, subject):
        return f"{self.name} is studying {subject}"

# 创建学生对象
student1 = Student("Alice", 18, "A")
student2 = Student("Bob", 17, "B")

# 调用对象的方法
info1 = student1.get_student_info()
study_result1 = student1.study("Math")

info2 = student2.get_student_info()
study_result2 = student2.study("History")

# 打印学生信息和学习结果
print(info1)
print(study_result1)

print(info2)
print(study_result2)

class HighSchoolStudent(Student):
    # 新的构造方法，可以在其中初始化子类特有的属性
    def __init__(self, name, age, grade, level):
        # 调用父类的构造方法，初始化共享的属性
        super().__init__(name, age, grade)
        # 初始化子类特有的属性
        self.level = level

    # 新的方法，可以在子类中添加特有的行为
    def participate_in_activity(self, activity):
        return f"{self.name} is participating in {activity} as a high school student"

# 创建高中学生对象
high_school_student = HighSchoolStudent("Charlie", 16, "A", "Senior")

# 调用继承自父类的方法
info = high_school_student.get_student_info()

# 调用子类特有的方法
activity_result = high_school_student.participate_in_activity("Science Fair")

# 打印学生信息和活动参与结果
print(info)
print(activity_result)