How do I remove an enemy after it has been hit 4 times with a bullet in Python?

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Python

Hi there,
I am trying to create a top-down shooter game in pygame. I want the enemy to be removed once a collision between the enemy and the Player_bullet has been detected 4 times but am unsure how to do this. Hoping someone can help.

Thanks.

This is my code for the detection between the Player_bullet and the enemy.

for enemy in enemies:
    for bullet in player_bullets:
        if pygame.Rect(enemy.hit_box).collidepoint(bullet.x, bullet.y):
            player_bullets.remove(bullet)
    enemy.main(display)

What I have tried:

I have tried a few tutorials but none of them are what I am looking for.