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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 set_led(self, led_number, led_value):
 """ Set front-panel controller LEDs. The DS3 controller has four, labelled, LEDs on the front panel that can be either on or off. :param led_number: Integer between 1 and 4 :param led_value: Value, set to 0 to turn the LED off, 1 to turn it on """

        if 1 > led_number > 4:
            return
        write_led_value(hw_id=self.device_unique_name, led_name='sony{}'.format(led_number), value=led_value)