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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 _setup_stdout(self):
 """Hook stdout and stderr if buffering is enabled. """

        if self.buffer:
            if self._stderr_buffer is None:
                self._stderr_buffer = StringIO()
                self._stdout_buffer = StringIO()
            sys.stdout = self._stdout_buffer
            sys.stderr = self._stderr_buffer