code: def _ffi_module(self):
      
      native_bin_dir = os.path.dirname(self.binary)
      logger.debug('loading native engine python module from: %s', native_bin_dir)
      sys.path.insert(0, native_bin_dir)
      return importlib.import_module(NATIVE_ENGINE_MODULE)
docs: Load the native engine as a python module and register CFFI externs.