code: def _get_flag_group(h5f, path):
      
      # if user chose the path, just use it
      if path:
          return h5f[path]
  
      # if the user gave us the group directly, use it
      if _is_flag_group(h5f):
          return h5f
  
      # otherwise try and find a single group that matches
      try:
          path, = _find_flag_groups(h5f)
      except ValueError:
          pass
      else:
          return h5f[path]
  
      # if not exactly 1 valid group in the file, complain
      raise ValueError(
          "please pass a valid HDF5 Group, or specify the HDF5 Group "
          "path via the ``path=`` keyword argument",
      )
docs: Determine the group to use in order to read a flag