实现学生选修课程成绩管理系统，要求如下： 编写类记录学生基本信息、学生选修的课程及学分；一个类为数据类，一个类为业务逻辑类，一个类为用户交互类 使用菜单提供以下功能，每个功能通过函数实现： • 添加新的学生； • 记录学生的选修课程及分数； • 使用文件存储学生的信息，并能够读取和显示； • 查询学生课程选修记录，显示平均成绩。

好的，我将为您编写一个满足您要求的学生选修课程成绩管理系统。首先，我们需要创建三个类：`Student`、`Course`和`ManagementSystem`。

class Student:
    def __init__(self, name, student_id):
        self.name = name
        self.student_id = student_id
        self.courses = []

    def add_course(self, course, score):
        self.courses.append((course, score))

    def calculate_average_score(self):
        if not self.courses:
            return 0
        total_score = sum(score for _, score in self.courses)
        return total_score / len(self.courses)


class Course:
    def __init__(self, name, credits):
        self.name = name
        self.credits = credits


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

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

    def save_to_file(self, filename):
        with open(filename, 'w') as file:
            for student in self.students:
                file.write(f"{student.name},{student.student_id}\n")
                for course, score in student.courses:
                    file.write(f"{course.name},{score}\n")

    def load_from_file(self, filename):
        self.students = []
        with open(filename, 'r') as file:
            lines = file.readlines()
            for i in range(0, len(lines), 2):
                name, student_id = lines[i].strip().split(',')
                student = Student(name, student_id)
                courses = lines[i + 1].strip().split(',')
                for j in range(0, len(courses), 2):
                    course_name, score = courses[j], float(courses[j + 1])
                    course = Course(course_name, score)
                    student.add_course(course, score)
                self.students.append(student)

    def display_student_info(self, student_id):
        for student in self.students:
            if student.student_id == student_id:
                print(f"Student Name: {student.name}")
                print(f"Student ID: {student.student_id}")
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