创建包含类的成绩册- Python

class Student:
    def __init__(self, name, grade):
        self.name = name
        self.grade = grade

class GradeBook:
    def __init__(self):
        self.students = []

    def add_student(self, student):
        self.students.append(student)

    def get_student_grade(self, name):
        for student in self.students:
            if student.name == name:
                return student.grade
        return None

    def get_all_students(self):
        return [student.name for student in self.students]

# 创建一个成绩册对象
grade_book = GradeBook()

# 添加学生
student1 = Student("Alice", 90)
student2 = Student("Bob", 85)
student3 = Student("Charlie", 95)

grade_book.add_student(student1)
grade_book.add_student(student2)
grade_book.add_student(student3)

# 获取学生的成绩
print(grade_book.get_student_grade("Bob"))  # 输出：85

# 获取所有学生的姓名
print(grade_book.get_all_students())  # 输出：['Alice', 'Bob', 'Charlie']