0001.py

i=3
username = "shabi"
userpassword = "102938"
while True:
    if i>0:
        name = input("用户名")
        password = input("密码")
        i=i-1
        if name == username and password == userpassword:
            print("登陆登录")
            break
        if name != username:
            print("用户名错误")
            print("你还有"+str(i)+"就没了")
            continue
        if password != userpassword:
            print("密码错误")
            print("你还有"+str(i)+"就没了")
    else:
        print("别输了，没够了还")
        exit()
print("登录成功")