name = input("请输入你要注册的用户名：")
password = input("请输入你要注册的用户名密码：")
b = 1
while b <= 3:
    b += 1
    usename = input("请输入用户名：")
    password2 = input("请输入密码：")
    if usename == name  and password2 == password:
        print("登录成功！")
        print("欢迎%s主人回家" %name)
        break
    else:
        c = 4
        c -= b
        if c > 0:
            print("用户名或密码输入错误，请重新输入")
            print("你还有%s次机会" %c)
            continue
        else:
            print("您今天的机会已经用完")
            print("你输入的次数太多，请明天再试！")
            break