Storing passwords with python

I have a program I'm writing in python, and I have the need to store some passwords. These passwords will be the passwords to ftp servers, so it's important that they're not just plainly visible to everybody. This also means that I can't store a non-reversible hash of the password like you would on a webserver, because I'm not checking if somebody inputs the right password, I'm just relaying the password to somebody else.
So what's the best way to store passwords? I'm using python, and the program will be linux-only.