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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def stderr(self):
 """ Returns stream writer for stderr to output Lambda function errors to Returns ------- samcli.lib.utils.stream_writer.StreamWriter Stream writer for stderr """

        stream = self._log_file_handle if self._log_file_handle else osutils.stderr()
        return StreamWriter(stream, self._is_debugging)