Returns the current motor speed in tacho counts per second. Note, this is
        not necessarily degrees (although it is for LEGO motors). Use the `count_per_rot`
        attribute to convert this value to RPM or deg/sec.

def speed(self):
        """
        Returns the current motor speed in tacho counts per second. Note, this is
        not necessarily degrees (although it is for LEGO motors). Use the `count_per_rot`
        attribute to convert this value to RPM or deg/sec.
        """
        self._speed, value = self.get_attr_int(self._speed, 'speed')
        return value