You should have the facebook python sdk installed. After that install the helpers and import as you need. The helper class is using CherryPy so you will also need that installed.
Create a new helper with your app id's:
fb = FBHelper(APP_ID, APP_SECRET, BASE_URL)
You can find the id & secret within your app settings. The base url is where the application is configured to be redirecting too. This must match what you've supplied Facebook in the app settings. Further redirect_uri updates will be based off of this base_url.
Facebook has a 2 step login method. First, initialize a request. Facebook will respond with a new code param in the URL. Check that is present and if so you can authorize the application. At this stage pass in the permissions you will need for your app:
if code is None:
fb.start_login(permissions='publish_checkins,publish_stream')
else:
access_token = fb.post_authorize(code)
Facebook should return with a valid access token. If the process fails to return a valid access token the app will return None so check before using the token with the graph calls.
This is a "barely working" class to aid dev'ing locally. It doesn't cover edge cases or handle errors beyond getting it working for now. Your mileage may vary.