学生信息管理系统 制作一个小型的学生学籍管理系统，要求制作一个菜单，实现数据的录入，数据的显示，数据查找，数据的删除，数据的保存，数据的统计，数据的修改，系统的退出。系统的设计要求用到Python语言程序设计，信息存储要求用到结构体来实现，同时每一个功能用到一个函数。用python编写代码

好的，下面是一个简单的学生信息管理系统的Python代码示例，包含菜单、数据录入、数据显示、数据查找、数据删除、数据保存、数据统计、数据修改、系统退出等功能。请注意，这只是一个示例代码，实际应用中可能需要根据具体需求进行修改和补充。

# 定义学生信息结构体
class Student:
    def __init__(self, id, name, gender, hometown, birthday, math_score, english_score, computer_score):
        self.id = id
        self.name = name
        self.gender = gender
        self.hometown = hometown
        self.birthday = birthday
        self.math_score = math_score
        self.english_score = english_score
        self.computer_score = computer_score

# 初始化学生列表
students = []

# 添加学生信息
def add_student():
    id = input("请输入学号：")
    name = input("请输入姓名：")
    gender = input("请输入性别：")
    hometown = input("请输入籍贯：")
    birthday = input("请输入生日：")
    math_score = int(input("请输入数学成绩："))
    english_score = int(input("请输入英语成绩："))
    computer_score = int(input("请输入计算机成绩："))
    student = Student(id, name, gender, hometown, birthday, math_score, english_score, computer_score)
    students.append(student)
    print("学生信息添加成功！")

# 显示学生信息
def show_students():
    for student in students:
        print("学号：{}，姓名：{}，性别：{}，籍贯：{}，生日：{}，数学成绩：{}，英语成绩：{}，计算机成绩：{}".format(student.id, student.name, student.gender, student.hometown, student.birthday, student.math_score, student.english_score, student.computer_score))

# 查找学生信息
def search_student():
    id = input("请输入要查找的学生学号：")
    for student in students:
        if student.id == id:
            print("找到了该学生信息：学号：{}，姓名：{}，性别：{}，籍贯：{}，生日：{}，数学成绩：{}，英语成绩：{}，计算机成绩：{}".format(student.id, student.name, student.gender, student.hometown, student.birthday, student.math_score, student.english_score, student.computer_score))
            return
    print("没有找到该学生信息！")

# 删除学生信息
def delete_student():
    id = input("请输入要删除的学生学号：")
    for student in students:
        if student.id == id:
            students.remove(student)
            print("学生信息删除成功！")
            return
    print("没有找到该学生信息！")

# 保存学生信息到文件
def save_students():
    file = open("students.txt", "w")
    for student in students:
        file.write("{}\t{}\t{}\t{}\t{}\t{}\t{}\t{}\n".format(student.id, student.name, student.gender, student.hometown, student.birthday, student.math_score, student.english_score, student.computer_score))
    file.close()
    print("学生信息保存成功！")

# 从文件中读取学生信息
def load_students():
    file = open("students.txt", "r")
    for line in file:
        fields = line.split("\t")
        student = Student(fields[0], fields[1], fields[2], fields[3], fields[4], int(fields[5]), int(fields[6]), int(fields[7]))
        students.append(student)
    file.close()
    print("学生信息加载成功！")

# 统计学生成绩
def calc_scores():
    math_sum = 0
    english_sum = 0
    computer_sum = 0
    for student in students:
        math_sum += student.math_score
        english_sum += student.english_score
        computer_sum += student.computer_score
    total_sum = math_sum + english_sum + computer_sum
    math_avg = math_sum / len(students)
    english_avg = english_sum / len(students)
    computer_avg = computer_sum / len(students)
    total_avg = total_sum / len(students)
    math_pass_rate = len([s for s in students if s.math_score >= 60]) / len(students)
    english_pass_rate = len([s for s in students if s.english_score >= 60]) / len(students)
    computer_pass_rate = len([s for s in students if s.computer_score >= 60]) / len(students)
    print("数学总分：{}，英语总分：{}，计算机总分：{}，总分：{}".format(math_sum, english_sum, computer_sum, total_sum))
    print("数学平均分：{}，英语平均分：{}，计算机平均分：{}，总平均分：{}".format(math_avg, english_avg, computer_avg, total_avg))
    print("数学及格率：{}，英语及格率：{}，计算机及格率：{}".format(math_pass_rate, english_pass_rate, computer_pass_rate))

# 菜单
def menu():
    print("=" * 30)
    print("1. 添加学生信息")
    print("2. 显示学生信息")
    print("3. 查找学生信息")
    print("4. 删除学生信息")
    print("5. 保存学生信息")
    print("6. 统计学生成绩")
    print("7. 修改学生信息")
    print("0. 退出系统")
    print("=" * 30)

# 修改学生信息
def modify_student():
    id = input("请输入要修改的学生学号：")
    for student in students:
        if student.id == id:
            student.name = input("请输入修改后的姓名：")
            student.gender = input("请输入修改后的性别：")
            student.hometown = input("请输入修改后的籍贯：")
            student.birthday = input("请输入修改后的生日：")
            student.math_score = int(input("请输入修改后的数学成绩："))
            student.english_score = int(input("请输入修改后的英语成绩："))
            student.computer_score = int(input("请输入修改后的计算机成绩："))
            print("学生信息修改成功！")
            return
    print("没有找到该学生信息！")

# 主程序
if __name__ == "__main__":
    load_students()
    while True:
        menu()
        choice = input("请输入操作序号：")
        if choice == "1":
            add_student()
        elif choice == "2":
            show_students()
        elif choice == "3":
            search_student()
        elif choice == "4":
            delete_student()
        elif choice == "5":
            save_students()
        elif choice == "6":
            calc_scores()
        elif choice == "7":
            modify_student()
        elif choice == "0":
            break
        else:
            print("输入有误，请重新输入！")
    print("欢迎下次再来！")