code: def get_release_environment(self, project, release_id, environment_id):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          if release_id is not None:
              route_values['releaseId'] = self._serialize.url('release_id', release_id, 'int')
          if environment_id is not None:
              route_values['environmentId'] = self._serialize.url('environment_id', environment_id, 'int')
          response = self._send(http_method='GET',
                                location_id='a7e426b1-03dc-48af-9dfe-c98bac612dcb',
                                version='5.1-preview.6',
                                route_values=route_values)
          return self._deserialize('ReleaseEnvironment', response)
docs: GetReleaseEnvironment.
          [Preview API] Get a release environment.
          :param str project: Project ID or project name
          :param int release_id: Id of the release.
          :param int environment_id: Id of the release environment.
          :rtype: :class:`<ReleaseEnvironment> <azure.devops.v5_1.release.models.ReleaseEnvironment>`