Returns stream writer for stderr to output Lambda function errors to

        Returns
        -------
        samcli.lib.utils.stream_writer.StreamWriter
            Stream writer for stderr

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)