code: def output(self, pin, value):
          
          if pin < 0 or pin > 15:
              raise ValueError('Pin must be between 0 and 15 (inclusive).')
          self._output_pin(pin, value)
          self.mpsse_write_gpio()
docs: Set the specified pin the provided high/low value.  Value should be
          either HIGH/LOW or a boolean (true = high).