Question

So I have a small game written in python, if you saw my previous question you know it is a “space invaders” clone.

So nearly everything is running smoothly right now except for a random error popping out once in a while. This is completely random, it can occur after some bullets have been fired, or it may not occur at all.

I have this code:

    for bullet in bullets:
        bullet.attack()
        if bullet.posy<=-20:
            bullet_draw=False
        if bullet_draw==True:
            bullet.draw()
        for enemy in enemies:
            if bullet.sprite.rect.colliderect(enemy.sprite.rect):
                enemy.health-=1
                bullets.remove(bullet)
                bullet_draw=False
            else:
                bullet_draw=True

Sometimes it gives me the following error.

Traceback (most recent call last):
  File "\Programming\space invaders\space.py", line 280, in <module>
    bullets.remove(bullet)
ValueError: list.remove(x): x not in list

Please note that this error is completely random; even if it is not, I cannot trace its origin though. Any help as to how to eliminate it?

Answer 1

Your bullet is hitting multiple enemies. You need to break out of the enemies loop.