学生管理系统

import json


def home_page():    # 首页界面
    print('='*40)
    print('**欢迎来到学生管理系统**'.center(30, ' '))
    print('◆□1.登     录'.center(36, ' '))
    print('◆□2.注     册'.center(36, ' '))
    print('◆□3.退     出'.center(36, ' '))
    print('=' * 40)
    n = int(input('请选择（1-3）：'))
    if n == 1:
        log_in()
    elif n == 2:
        sign_in()
    elif n == 3:
        pass
    else:
        print('输入数据无效')
        home_page()


def log_in():  # 登录界面
    print('=' * 40)
    print('**登录**'.center(38, ' '))
    global user_name
    user_name = input('请输入用户名：')
    pw = input('请输入密码（3-6位）：')
    with open('data.json', 'r', encoding='utf-8') as f:
        content = json.loads(f.read())
    for dict1 in content:
        if dict1['username'] == user_name:
            if dict1['password'] == pw:
                print('登录成功！')
                return menu()
            else:
                print('登录失败！密码输入错误')
                return home_page()
    else:
        print('登录失败！用户没注册！')
        return home_page()


def sign_in():  # 注册界面
    print('=' * 40)
    print('**注册**'.center(38, ' '))
    user_name1 = input('请输入用户名：')
    while True:
        pw = input('请输入密码（3-6位）：')
        pw1 = input('请确认密码：')
        if len(pw) < 3 or len(pw) > 6:
            print('输入密码不规范')
            continue
        elif pw != pw1:
            print('两次输入的密码不一致')
            continue
        else:
            break
    with open('data.json', 'r', encoding='utf-8') as f:
        content = json.loads(f.read())
    for dict1 in content:
        if dict1['username'] == user_name1:
            print('该用户名已注册')
            return home_page()
    with open('data.json', 'w', encoding='utf-8') as f:
        content.append({'username': user_name1, 'password': pw, 'students': []})
        f.write(json.dumps(content))
    print('注册成功！')
    return home_page()


def menu():  # 菜单界面
    print('=' * 40)
    print('☺☺欢迎%s' % user_name)

    print('☀ 1. 添加学生')
    print('☀ 2. 查看学生')
    print('☀ 3. 修改学生信息')
    print('☀ 4. 删除学生')
    print('☀ 5. 返回')
    n = int(input('请选择：'))
    if n == 1:
        return add_student()


def add_student():  # 添加学生
    global student
    print('=' * 40)
    print('**添加学生信息**'.center(36, ' '))
    with open('data.json', 'r', encoding='utf-8') as f:
        content = json.loads(f.read())
    # print(content)
    for dict1 in content:
        if dict1['username'] == user_name:
            student = dict1
            break
    name = input('输入学生姓名：')
    # print(student)
    for index in student['students']:
        if name == index['name']:
            print('该学生已存在！')
            return menu()
    age = int(input('输入学生年龄：'))
    gender = input('输入学生性别：')
    tel = input('输入电话号码：')
    student['students'].append({'name': name, 'age': age, 'gender': gender, 'tel': tel})
    with open('data.json', 'w', encoding='utf-8') as f:
        f.write(json.dumps(content))
    print('添加成功！')
    print('='*40)
    print('1.继续添加')
    print('2.返回')
    n = int(input('请选择：'))
    if n == 1:
        return add_student()
    elif n == 2:
        return menu()


if __name__ == '__main__':
    home_page()