i=3
username="python"
userpassword="123456"
while True:
    if i>0:
        name=input("请输入账号:")
        password = input("请输入密码")
        i-=1
        if name!=username:
            print("账号错误")
            print("还剩下"+str(i)+"次")
            continue
        if password!=userpassword:
            print("密码错误")
            print("还剩下"+str(i)+"次")
            continue
        if password == userpassword and name == username :
            print("登录成功")
            break
    else:
        print("账号冻结")
        exit()