docs: def _open_ds_from_store(fname, store_mod=None, store_cls=None, **kwargs):
      """Open a dataset and return it"""
      if isinstance(fname, xr.Dataset):
          return fname
      if not isstring(fname):
          try:  # test iterable
              fname[0]
          except TypeError:
              pass
          else:
              if store_mod is not None and store_cls is not None:
                  if isstring(store_mod):
                      store_mod = repeat(store_mod)
                  if isstring(store_cls):
                      store_cls = repeat(store_cls)
                  fname = [_open_store(sm, sc, f)
                           for sm, sc, f in zip(store_mod, store_cls, fname)]
                  kwargs['engine'] = None
                  kwargs['lock'] = False
                  return open_mfdataset(fname, **kwargs)
      if store_mod is not None and store_cls is not None:
          fname = _open_store(store_mod, store_cls, fname)
      return open_dataset(fname, **kwargs)