i=5
username = "python"
userpassword = "123456"
while True:
    if i>0:
        name = input("请输入用户名:")
        password = input("请输入密码:")
        i-=1
        if name == username and password == userpassword:
            print("登录成功!")
            break
        if name!=username:
            print("用户名错误!请重新输入")
            print("温馨提示,您还剩"+str(i)+"次机会")
            continue
        if password!=userpassword:
            print("密码错误!请重新输入")
            print("温馨提示,您还剩"+str(i)+"次机会")
    else:
        print("你的账号已被封禁，请到我司解封")
        exit()
print("欢迎来到贝尔编程!")