516 

   516 

   517     def __delattr__(self, attr):

   517     def __delattr__(self, attr):

   518         return delattr(self._origfh, attr)

   518         return delattr(self._origfh, attr)

   519 

   519 

   520     def __enter__(self):

   520     def __enter__(self):

   522 

   523 

   523     def __exit__(self, exc_type, exc_value, exc_tb):

   524     def __exit__(self, exc_type, exc_value, exc_tb):

   524         raise NotImplementedError('attempted instantiating ' + str(type(self)))

   525         raise NotImplementedError('attempted instantiating ' + str(type(self)))

   525 

   526 

   526     def close(self):

   527     def close(self):