用户登录程序，读取文件用户名，锁定写入文件

读取文件：

mport json

user_list = {
    'andy': "123456",
    'william':'123456',
    'abc': "123456",
    'bcd':'123456',
    'cde': '123456',
    'def': "123456",
    'efg': '123456',
    }

jsObj = json.dumps(user_list)
fileObject = open('jsonFile.json', 'w')
fileObject.write(jsObj)
fileObject.close()

用户登录程序：

#Author:xiesongyou
import json
times = 0
login = False
while times < 3 and login == False: #用户名错可以输入3次用户名
    with open('login_3_times.json') as json_file:
        data = json.load(json_file)
    username=input("请输入用户名>>")
    if username in data:
        print("用户已锁定，请联系管理员！")
        login = True
    else:
        fileObject = open('jsonFile.json')
        user_list = json.load(fileObject)
        if username in user_list:
            count = 0
            userpwd = input("请输入密码>>")
            while count<3:

                if userpwd == user_list[username]:
                    login = True
                    print("欢迎登陆...")
                    break
                count += 1
                if count < 3: #可以输入3次密码
                    userpwd = input("请重新输入密码>>")
                else:
                    with open('login_3_times.json') as json_file:
                        data = json.load(json_file)
                    data[username]="123456"

                    jsObj = json.dumps(data)
                    fileObject = open('login_3_times.json',"w")
                    fileObject.write(jsObj)
                    fileObject.close()
                    print("用户已锁定！")
        else:

            times += 1
            print("用户名错误！%d 次"%times)