import osstu_list = []def show_menu():    print('1.添加学生')    print('2.删除学生')    print('3.修改学生信息')    print('4.查询单个学生信息')    print('5.查询所有学生信息')    print('6.退出系统')def insert_student():    name = input('请输入学生名字:')    for stu in stu_list:        if stu['name'] == name:            print('.........学生信息已存在........')            return    age = input('请输入学生年龄:')    gender = input('请输入学生性别:')    stu_dict = {'name': name, 'age': int(age), 'gender': gender}    stu_list.append(stu_dict)    print("学生信息添加成功!")def remove_student():    name = input('请输入要操作的学生的名字:')    for stu in stu_list:        if stu['name'] == name:            stu_list.remove(stu)            print('删除成功!')            break    else:        print('........该学生信息不存在,无法删除.........')def modify_student():    name = input('请输入要操作的学生的名字:')    for stu in stu_list:        if stu['name'] == name:            stu['age'] = int(input('请输入新的年龄:'))            print('修改成功!')            break    else:        print('........该学生信息不存在,无法修改.........')def search_student():    name = input('请输入要操作的学生的名字:')    for stu in stu_list:        if stu['name'] == name:            print(f'姓名:{stu["name"]},年龄:{stu["age"]},性别:{stu["gender"]}')            break    else:        print('........该学生信息不存在.......')def show_all_stu():    if len(stu_list):        for stu in stu_list:            print(f'姓名:{stu["name"]},年龄:{stu["age"]},性别:{stu["gender"]}')    else:        print("目前没有学生信息!")def save():    f = open('student.txt', 'w')    f.write(str(stu_list))    f.close()def read_file():    global stu_list    if os.path.exists('student.tct'):        f = open('student.txt', 'r', encoding='utf-8')        buf = f.read()        if buf:            stu_list = eval(buf)        f.close()def main():    read_file()    while True:        show_menu()        opt = input('请输入用来选择的编号:')        if opt == '1':            print('1.添加学生')            insert_student()        elif opt == '2':            print('2.删除学生')            remove_student()        elif opt == '3':            print('3.修改单个学生信息')            modify_student()        elif opt == '4':            print('查询单个学生信息')            search_student()        elif opt == '5':            print('5.查询所有学生信息')            show_all_stu()        elif opt == '6':            print('欢迎下次使用本系统')            save()            break        else:            print('输入有误，请重新输入')            continue        input('........回车键继续操作........')main()

import student_manage_sysytem as smsif __name__ == '__main__':    stu_sms = sms.StudenManagerSystem()    stu_sms.start()

class Student():    def __init__(self, stu_id, name, age, gender):        self.sut_id = stu_id        self.name = name        self.age = age        self.gender = gender    def __str__(self):        return f"{self.sut_id},{self.name},{self.age},{self.gender}"

import studentclass StudenManagerSystem():    def __init__(self):        self.stu_dict = {}    @staticmethod    def __show_menu():        print('1.添加学生')        print('2.删除学生')        print('3.修改学生信息')        print('4.查询单个学生信息')        print('5.查询所有学生信息')        print('6.退出系统')    def __insert_student(self):        stu_id = input('请输入学生学号:')        if stu_id in self.stu_dict:            print('学生信息已经存在，不需要重复添加')            return        name = input('请输入学生名字:')        age = input('请输入学生年龄:')        gender = input('请输入学生性别:')        stu = student.Student(stu_id, name, age, gender)        self.stu_dict[stu_id] = stu    def __removw_student(self):        stu_id = input('请输入学号:')        if stu_id in self.stu_dict:            del self.stu_dict[stu_id]            print('学生已经删除')        else:            print('学生信息不存在，无法删除')    def __modify_student(self):        stu_id = input('请输入学号:')        if stu_id in self.stu_dict:            stu = self.stu_dict[stu_id]            stu.age = input('请输入新的年龄:')            print('信息已经修改完毕')        else:            print('学生信息不存在，无法修改')    def __search_student(self):        stu_id = input('请输入学号:')        if stu_id in self.stu_dict:            stu = self.stu_dict[stu_id]            print(stu)        else:            print('学生信息不存在')    def __save(self):        f = open('student.txt', 'w', encoding='utf-8')        for stu in self.stu_dict.values():            f.write(str(stu) + '/n')        f.close()    def __load_info(self):        try:            f = open('student.txt', 'r', encoding='utf-8')            buf_list = f.readlines()            for buf in buf_list:                buf = buf.strip()                info_list = buf.split(',')                stu = student.Student(*info_list)                stu_id = info_list[0]                self.stu_dict[stu_id] = stu            f.close()        except Exception:            pass    def __show_all_info(self):        for stu in self.stu_dict.values():            print(stu)    def start(self):        self.__load_info()        while True:            self.__show_menu()            opt = input('请输入用来选择的编号:')            if opt == '1':                print('1.添加学生')                self.__insert_student()            elif opt == '2':                print('2.删除学生')                self.__removw_student()            elif opt == '3':                print('3.修改单个学生信息')                self.__modify_student()            elif opt == '4':                print('查询单个学生信息')                self.__search_student()            elif opt == '5':                print('5.查询所有学生信息')                self.__show_all_info()            elif opt == '6':                self.__save()                print('欢迎下次使用本系统')                break            else:                print('输入有误，请重新输入')                continue            input('........回车键继续操作........')