...................................................................................
import json
with open('users.json', 'w') as f_users:
json.dump([], f_users)

with open('student_system.json', 'w') as f_student:
json.dump([], f_student)
......................................................................................
print('学生管理系统')
print('===========================')
import json
def zhanghao():
username = input('请输入用户名：')
password = input('请输入密码：')
return username,password

def add_student():
stu_id=input('请输入学号：')
name = input('请输入姓名：')
age = int(input('请输入年龄：'))
tel = int(input('请输入电话：'))
return stu_id,name,age,tel

def xuanze():
option5=int(input('请输入选项：'))
return option5

def option2():
print('1:继续', '2:返回上一级', sep='\n')
x=input('请输入选项：')

while True:
    o = int(x)
    if o==1 or o==2:
        return o
    else:
        x = input('输入错误，请重新输入选项：')

def fenge():
print('===============================')

=======================登录==============================

with open('users.json', 'r') as f_users:
users=json.load(f_users)

while True:
print('1:注册账号', '2:登录账号', sep='\n')
xuanxiang=xuanze()

if xuanxiang==1:

    username,password = zhanghao()
    user = {'username': username, 'password': password}
    users.append(user)
    with open('users.json','w') as f_users:
        json.dump(users,f_users)
    with open('student_system.json','r') as fr_student:
        student_system=json.load(fr_student)
        student_system.append([])
    with open('student_system.json', 'w') as f_student:
        json.dump(student_system,f_student)
    print('注册成功，返回上一级')
    fenge()
    continue
elif xuanxiang==2:
    username, password = zhanghao()
    user_index = -1
    count = 0
    with open('users.json') as fr_users:
        users=json.load(fr_users)
    for x in users[:]:

        user_index += 1
        if x['username']==username:
            count+=1
            while True:
                if x['password']==password:
                    print('登陆成功')
                    fenge()
                    break
                else:
                    print('密码错误，请重新输入',)
                    fenge()
                    password = input('请输入密码：')
                    if password==1:
                        break

            break
    if count==0:
        print('用户不存在,请重新输入')
        continue

else:
    print('输入错误，请重新输入')
    continue

break

=========================操作===============================

with open('student_system.json', 'r') as f_student:
student_system =json.load(f_student)

userx=student_system[user_index]

while True:
print('1:添加学生', '2:修改学生', '3:删除学生','4:查看所有学生' ,'5:退出', sep='\n')
fenge()
a=xuanze()
if a<=5:
option =a
else:
print('输入错误，请重新输入')
continue

while option<5:
    # ==============================================
    if option==1:  #添加学生
        stu_id,name,age,tel=add_student()
        fenge()
        student={'stu_id':stu_id,'name':name,'age':age,'Tel':tel}
        userx.append(student)
        with open('student_system.json', 'w') as f_student:
            json.dump(student_system,f_student)
        print('添加完成')
        fenge()
        option1 = option2()

        fenge()
        if option1 == 1:
            continue
        elif option1 == 2:
            break
        else:
            print('输入错误，请重新输入')
    #     =================================================
    elif option==2:#修改学生,输入姓名，查找学生进行修改
        with open('student_system.json', 'r') as fr_student:
            student_system=json.load(fr_student)
        name = input('请输入姓名：')
        fenge()
        index=-1
        for x in userx[:]:
            index += 1
            if x['name']==name:
                print(index,x,sep=':')
        fenge()
        stu_option=int(input('请输入选项：'))
        age = int(input('请输入年龄：'))
        tel = int(input('请输入电话：'))
        userx[stu_option]['age']=age
        userx[stu_option]['tel']=tel
        with open('student_system.json', 'w') as f_student:
            json.dump(student_system,f_student)
        print('修改完成',userx[stu_option])
        fenge()
        option1 = option2()
        fenge()
        if option1 == 1:
            continue
        else:
            break
    #     =======================================
    elif option == 3:   #删除学生
        with open('student_system.json', 'r') as fr_student:
            student_system=json.load(fr_student)
        name = input('请输入姓名：')
        fenge()
        index = -1
        for x in userx[:]:
            index += 1
            if x['name'] == name:
                print(index, x, sep=':')
                fenge()
        stu_option = int(input('请输入选项：'))
        del userx[stu_option]
        with open('student_system.json', 'w') as f_student:
            json.dump(student_system,f_student)
        print('删除完成')
        fenge()
        option1 = option2()
        fenge()
        if option1 == 1:
            continue
        else:
            break

    elif option==4:  #查看所有学生
        with open('student_system.json', 'r') as fr_student:
            student_system=json.load(fr_student)
        for stu in userx[:]:
            print(stu)
        fenge()
        option1 = option2()
        fenge()
        if option1 == 1:
            continue
        else:
            break
if option==5:
    break

print('退出系统')