So the simplest way is going to just be to grab a logged in session browser cookie - I believe it's the ljuniq cookie, specifically. Then you can set that in the Requests object and it'll act as a logged in cookie session.

There's a way to auth through the old XML-RPC api but I would have to look it up - you have to pass an MD5-hashed version of your username and API key to a specific endpoint and you get an auth cookie back.