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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 close(self):
 """Close the sysfs LED. Raises: LEDError: if an I/O or OS error occurs. """

        if self._fd is None:
            return

        try:
            os.close(self._fd)
        except OSError as e:
            raise LEDError(e.errno, "Closing LED: " + e.strerror)

        self._fd = None