get_object() will query the root node directly, not the non-root nodes. Use get_connections() instead.
Read more here about objects: https://developers.facebook.com/docs/graph-api/reference/
Try below code, it works for me.
import facebookfacebook_api = facebook.GraphAPI(access_token='YOUR_ACCESS_TOKEN')facebook_feed = facebook_api.get_connections('YOUR_PAGE_ID', 'feed', since=1496707200)print facebook_feed['data']