<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get(self):
 """ Return registered user with the given user id. http://www.keycloak.org/docs-api/3.4/rest-api/index.html#_users_resource """

        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