code: def get_auth_settings():
      
      from yacms.conf import settings
      try:
          auth_settings = (settings.TWITTER_CONSUMER_KEY,
                           settings.TWITTER_CONSUMER_SECRET,
                           settings.TWITTER_ACCESS_TOKEN_KEY,
                           settings.TWITTER_ACCESS_TOKEN_SECRET)
      except AttributeError:
          return None
      else:
          return auth_settings if all(auth_settings) else None
docs: Returns all the key/secret settings for Twitter access,
      only if they're all defined.