student_id = []
student_name = []
student_age = []
student_class = []
student_count = 0
while True:
    result1 = 'y'
    r = 'y'
    title_sys = '学生信息管理系统'
    title_fun1 = '1       添加学生'
    title_fun2 = '2       修改信息'
    title_fun3 = '3       查看学生'
    title_fun4 = '4       立即退出'
    print(title_sys.center(50),end='\n\n')
    print(title_fun1.center(50))
    print(title_fun2.center(50))
    print(title_fun3.center(50))
    print(title_fun4.center(50))
    print('本系统学生编号自动生成，根据登记次序为‘2018_xxx’')
    print('='*50)
    try:
        order = int(input('请选择要进行的操作：'))
        if order == 1:
            while result1 == 'y':
                s_n = input('输入学生姓名：')
                s_a = input('输入学生年龄：')
                s_c = input('请为该生分配其班级：')
                student_count += 1
                student_name.append(s_n)
                student_age.append(s_a)
                student_class.append(s_c)
                str_id = '2018_'+str(student_count).rjust(3,'0')
                student_id.append(str_id)
                print('添加成功')
                result1 = input('是否继续添加y/n：')
            print('-'*50)
        elif order == 2:
                while r == 'y':
                    if len(student_id) != 0:
                        result2 = 'y'
                        flag = 1
                        print('可用于修改的学生id：',student_id)
                        updata_id = input('请输入要修改学生的id：')
                        index = student_id.index(updata_id)
                        while result2 == 'y':
                            m1 = '请选择修改项'
                            m2 = '1.学生姓名'
                            m3 = '2.学生年龄'
                            m4 = '3.分配班级'
                            m5 = '4.直接删除'
                            print(m1.center(50),end='\n\n')
                            print(m2.center(50))
                            print(m3.center(50))
                            print(m4.center(50))
                            print(m5.center(50))
                            print('-'*50)
                            updata_order = int(input('您的选择是：'))
                            if updata_order == 1:
                                student_name[index] = input('请输入新名字：')
                                print('修改完毕')
                            elif updata_order == 2:
                                student_age[index] = input('请输入新年龄：')
                                print('修改完毕')
                            elif updata_order == 3:
                                student_class[index] = input('请输入新班级：')
                                print('修改完毕')
                            else:
                                flag = 0
                                del student_name[index]
                                del student_age[index]
                                del student_class[index]
                                del student_id[index]
                                print('删除完毕')
                            if flag:
                                result2 = input('是否继续修改该学生的信息 y/n：')
                            else:
                                result2 = 'n'
                        r = input('是否继续修改学生信息 y/n：')
                    else:
                        print('无可修改项')
                        break
                print('-'*50)
        elif order == 3:
            try:
                for i in range(student_count):
                    print('学生id：%s 学生姓名：%s 学生年龄：%s 学生班级：%s'%(student_id[i],student_name[i],student_age[i],student_class[i]))
            except:
                print('无记录')
            print('-'*50)
        else:
                break
    except:
        continue

结果如下（部分）：

image.png