Python 登录系统

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该程序主要实现了以下3点功能：

1.用户登录验证

2登陆成功出现欢迎信息

3连续登录三次，密码错误冻结账号

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uesr_db 为用户账号密码等信息：

{"username":"asd","password":"1234","erro":1}
{"username":"fffdsaf","password":"1234ff","erro":1}
{"username":"asdf","password":"1234ff","erro":1}
{"username":"sdaf","password":"1234565","erro":1}

f2 为已冻结账号：

{'password': '1234', 'erro': 1, 'username': 'asd'}

登录系统代码：

import sys

def log_in():
    username = input("please input you username:").strip()
    password = input("please input your password:").strip()
    return username,password

f = open("user_db","r+")
userinfo = f.readlines()

cout = 0
username,password = log_in()

def main(username,password):

    cout = 0
    for i in userinfo:
        i = eval(i.strip())
        with open("f2", "r") as f2:
            frozen_user = f2.readlines()
            for x in frozen_user:
                x = eval(x.strip())
                if username == x["username"] :
                    print("您的账号已冻结")
                    sys.exit(0)
        if username == i["username"]:
            while(1):
                if username == i["username"]:
                    if password == i["password"]:
                        print("您已成功登陆")
                        sys.exit(0)
                    else:
                        cout +=1
                        if cout <4 :
                            print("密码错误!")
                            username, password = log_in()
                        else:
                            print("您的账号已冻结")
                            a = str(i)
                            with open("f2","w") as f2:
                                f2.write(a)
                            break
                else:
                    main(username, password)
            break

        else:
            cout +=1
            if cout < len(userinfo):

                continue
            else:
                print("您的账号不存在")
                username, password = log_in()
                main(username, password)


main(username,password)