def GetLoadingOrder(self):
    result = {}
    for filename, mapping in self._file_mapping.iteritems():
      loading_order = mapping['loading_order']
      if loading_order is not None:
        result[loading_order] = filename
    return list(result[key] for key in sorted(result))
Returns a list of filenames sorted by loading order.
dataset/ETHPy150Open google/transitfeed/transitfeed/gtfsfactory.py/GtfsFactory.GetLoadingOrder