我需要在Python中安全地存储用户名和密码，我的选项是什么?

I'm writing a small Python script which will periodically pull information from a 3rd party service using a username and password combo. I don't need to create something that is 100% bulletproof (does 100% even exist?), but I would like to involve a good measure of security so at the very least it would take a long time for someone to break it. I'm writing a small Python script which will pe