code: def users(self, username=None, pk=None, **kwargs):
          
          request_params = {
              'username': username,
              'pk': pk,
          }
          if kwargs:
              request_params.update(**kwargs)
  
          r = self._request('GET', self._build_url('users'), params=request_params)
  
          if r.status_code != requests.codes.ok:  # pragma: no cover
              raise NotFoundError("Could not find users: '{}'".format(r.json()))
  
          data = r.json()
          return [User(user, client=self) for user in data['results']]
docs: Users of KE-chain.
  
          Provide a list of :class:`User`s of KE-chain. You can filter on username or id or any other advanced filter.
  
          :param username: (optional) username to filter
          :type username: basestring or None
          :param pk: (optional) id of the user to filter
          :type pk: basestring or None
          :param kwargs: Additional filtering keyword=value arguments
          :type kwargs: dict or None
          :return: List of :class:`Users`
          :raises NotFoundError: when a user could not be found