code: def get(self):
          
          self._user = self._client.get(
              url=self._client.get_full_url(
                  self.get_path(
                      'single', realm=self._realm_name, user_id=self._user_id
                  )
              )
          )
          self._user_id = self.user["id"]
          return self._user
docs: Return registered user with the given user id.
  
          http://www.keycloak.org/docs-api/3.4/rest-api/index.html#_users_resource