def _next(self, parent):
        self._active_systems.append(
            StarExplosion(
                self._screen, parent.x, parent.y, 10 - self._life_time,
                randint(6, 20), on_each=self._trail))
dataset/ETHPy150Open peterbrittain/asciimatics/asciimatics/particles.py/StarFirework._next/swapped operands of `-`