how to use refresh token

[H F.M]

Hi 

I am using this script to use feedly token but the problem is that I should update this token each month. I heard that I can use refresh token to update it automatically but don't know how I can do it in python. I appreciate if you can guide me on how to do it. 

sess = FeedlySession(auth=token, api_host=host, user_id = getenv("FEEDLY_USER_ID"))

THANKS