cat login.py

#!/usr/bin/python
import getpass   ###getpass模块中的getpass方法

usname = raw_input('username:')  ###接收用户输入的字符
passwd = getpass.getpass('password:')  ###将敏感的密码隐藏

if usname == 'bob' and passwd == '123456':
print "Login successful"
else:
print "login incorrect"