验证账号密码1次机会

#!/usr/bin/env python
#Zhangpengfei


_username = 'zhangpengfei'
_password = '123456'
username = input("username:")
password = input("password:")

if _username == username and _password == password:
    print("Welcome user {name} login...".format(name=username))
else:
    print("Invalid username or password")