from oauth2 import Client,Token,Consumer
from pytwit import TwitterAPI

consumer_key    = "hoge"
consumer_secret = "huga"
access_token    = "foo"
access_token_secret = "bar"

api = TwitterAPI(Client(Consumer(consumer_key,consumer_secret),
                        Token(access_token,access_token_secret))

api.status.update("つぶやきたいことをここへ入れる")