code: def get_comments(self, id, project=None, from_revision=None, top=None, order=None):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          if id is not None:
              route_values['id'] = self._serialize.url('id', id, 'int')
          query_parameters = {}
          if from_revision is not None:
              query_parameters['fromRevision'] = self._serialize.query('from_revision', from_revision, 'int')
          if top is not None:
              query_parameters['$top'] = self._serialize.query('top', top, 'int')
          if order is not None:
              query_parameters['order'] = self._serialize.query('order', order, 'str')
          response = self._send(http_method='GET',
                                location_id='19335ae7-22f7-4308-93d8-261f9384b7cf',
                                version='5.0-preview.2',
                                route_values=route_values,
                                query_parameters=query_parameters)
          return self._deserialize('WorkItemComments', response)
docs: GetComments.
          [Preview API] Gets the specified number of comments for a work item from the specified revision.
          :param int id: Work item id
          :param str project: Project ID or project name
          :param int from_revision: Revision from which comments are to be fetched (default is 1)
          :param int top: The number of comments to return (default is 200)
          :param str order: Ascending or descending by revision id (default is ascending)
          :rtype: :class:`<WorkItemComments> <azure.devops.v5_0.work_item_tracking.models.WorkItemComments>`