code: def get_row_by_fsid(self, fs_id):
          '''确认在Liststore中是否存在这条任务. 如果存在, 返回TreeModelRow,
          否则就返回None'''
          for row in self.liststore:
              if row[FSID_COL] == fs_id:
                  return row
          return Nonf get_row_by_fsid(self, fs_id):
          '''确认在Liststore中是否存在这条任务. 如果存在, 返回TreeModelRow,
          否则就返回None'''
          for row in self.liststore:
              if row[FSID_COL] == fs_id:
                  return row
          return None
docs: 确认在Liststore中是否存在这条任务. 如果存在, 返回TreeModelRow,
          否则就返回None