<每日一题>题目7：简单的学生管理系统V1.0

'''

# 学生管理系统ｖ1.0

# 添加学生的信息

# 删除学生的信息

# 修改学生的信息

# 查看学生的信息

#遍历学生的信息

#退出系统

'''

import json

#1 显示操作功能

def showinfo():

    print('*'*40)

    print("\t  　欢迎使用学生管理系统V1.0")

    print("1.添加学生的信息")

    print("2.删除学生的信息")

    print("3.修改学生的信息")

    print("4.查询学生的信息")

    print("5.遍历所有学生的信息")

    print("6.退出系统")

    print('*' * 40)

students = []

def add_student():

    print("您选择了添加学生信息功能！")

    ID = input("请输入学生学号：")

    name = input("请输入学生姓名：")

    age = input("请输入学生年龄：")

    sex = input("请输入学生性别：")

    if len(students) == 0:

        stu_info = {}

        stu_info["ID"] = ID

        stu_info["name"] = name

        stu_info["age"] = age

        stu_info["sex"] = sex

        students.append(stu_info)

        print("学生%s添加成功" % stu_info)

    else:

        for i in students:

            if i["ID"] == ID:

                print("学号重复，请查询后在进行添加！")

                break

            else:

                stu_info = {}

                stu_info["ID"] = ID

                stu_info["name"] = name

                stu_info["age"] = age

                stu_info["sex"] = sex

                students.append(stu_info)

                print("学生%s添加成功"%stu_info)

    save_students()

    main()

def alter_student():

    print("欢迎使用修改学生信息功能！")

    ID = input("请输入需要修改学生的学号:")

    leap = 0

    for i in students:

        if i["ID"] == ID:

            alter_ID = input("请输入修改后的学号:")

            for i in students:

                if i["ID"] == alter_ID:

                    print("学号重复，请查询后在进行修改！")

                    leap = 1

                    break

            if leap != 1:

                alter_name = input("请输入修改后的名字：")

                alter_sex = input("请输入修改后的性别：")

                alter_age = input("请输入修改后的年龄：")

                i["ID"] = alter_ID

                i["name"] = alter_name

                i["age"] = alter_age

                i["sex"] = alter_sex

                save_students()

        else:

            print("查无此人，请查询后在进行修改！")

            break

    main()

def del_student():

    print("您选择了删除学生信息功能！")

    ID = input("请输入需要删除学生的学号：")

    for i in students:

        if i['ID'] == ID:

            print("学生%s删除成功"%i)

            del students[students.index(i)]

            save_students()

            break

        else:

            print("输入的学号有误，请查询后重试！")

    main()

def inquire_student():

    print("欢迎使用学生查询功能：")

    inquire_ID = input("请输入查询学生学号：")

    for i in students:

        if i["ID"] == inquire_ID:

            print('查询学生信息如下',end="\n")

            print("学号：%s\t姓名：%s\t年龄:%s\t性别：%s"%(i["ID"],i["name"],i["age"],i["sex"]))

        else:

            print("查无此人")

    main()

def exit_student():

    print("真的要退出么？")

    demo = str(input("输入yes退出，输入no不退出:"))

    demo=demo.lower()

    if demo == "yes":

        return

    elif demo == "no":

        main()

    else:

        print("输入有误，重新输入")

        exit_student()

def show_student():

    print("欢迎使用遍历学生的信息功能")

    for i in students:

        print("学号：%s\t姓名：%s\t年龄:%s\t性别：%s" % (i["ID"], i["name"], i["age"], i["sex"]))

    main()

def select(key):

    if key == 1:

        add_student()

    elif key == 2:

        del_student()

    elif key == 3:

        alter_student()

    elif key == 4:

        inquire_student()

    elif key == 5:

        show_student()

    elif key == 6:

        exit_student()

    else:

        print("输入有误，请重新输入！")

def save_students():

    file = json.dumps(students,ensure_ascii=False)

    with open('students.txt','w+',encoding='utf-8') as f:

        f.write(file)

def main():

    showinfo()

    key = int(input("请选择您要进行的操作（序号）："))

    select(key)

if __name__ == '__main__':

    main()