code: def iter_followers(username, number=-1, etag=None):
      
      return gh.iter_followers(username, number, etag) if username else []
docs: List the followers of ``username``.
  
      :param str username: (required), login of the person to list the followers
          of
      :param int number: (optional), number of followers to return, Default: -1,
          return all of them
      :param str etag: (optional), ETag from a previous request to the same
          endpoint
      :returns: generator of :class:`User <github3.users.User>`