import getpass
i = 3
while i > 0:
    x = input (‘请输入用户名：‘)
    y = getpass.getpass(‘请输入密码：‘)
    if x == ‘123‘ and y == ‘456‘:
        print(‘登陆成功‘)
        break
    else:
        print(‘请重新输入‘)
    i -= 1
if i == 0:
    print(‘错误次数超过3次‘)