code: def _gettables(self):
          
  
          groups = self._h5file.list_nodes("/")
          if len(groups) == 0:
              return []
          else:
              return [
                  gr.PyMCsamples for gr in groups if gr._v_name[:5] == 'chain']
docs: Return a list of hdf5 tables name PyMCsamples.