code: def iter_followers(self, number=-1, etag=None):
          
          url = self._build_url('followers', base_url=self._api)
          return self._iter(int(number), url, User, etag=etag)
docs: Iterate over the followers of this user.
  
          :param int number: (optional), number of followers to return. Default:
              -1 returns all available
          :param str etag: (optional), ETag from a previous request to the same
              endpoint
          :returns: generator of :class:`User <User>`\ s