输入用户名和密码，判断是否登录成功，重试次数为3次

1、输入用户名和密码，判断是否登录成功，重试次数为3次

_username = 'alren'
_password = 'alren'
for i in range(3):
    username = input('please input your name: ')
    password = input('please input your password: ')
    if username == _username and password == _password:
        print('login success....')
    else:
        print('your password or username is not correct')
print('-------------------------------------------------')

for i in range(3):
    username = input('please input your name: ')
    password = input('please input your password: ')
    if username == _username and password == _password:
        print('login success....')
    elif username  == _username and password != _password:
        print('password is error')
    elif username != _username and password == _password:
        print('username is error')
    else:
        print('your password or username is not correct')