diy.4.py

usename = "python"
password = "123456"
while True:
    if i>0:
        us = input("请输入您的用户名：")
        if us != usename :
            print("用户名不正确，请重新输入！")
            continue
        ps = input("请输入您的密码：")
        if ps != password :
            print("密码不正确，请重新输入！")
            continue
        if (us == usename)and(ps == password):
            print("用户名,密码正确")
            break
    else:
        print("您的账户已被锁定，请拿证件")：
        exit()