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Comment by ansk | Hacker News Reader

And on the seventh day, God ended His work which He had done and began vibe coding the remainder of the human genome.

this should do the trick...

  while creatures:
    c = get_random_creature()
    if c.is_dead():
      creatures.pop(c)
    else:
      creatures.add(c.mutate())

You also need selection, not just mutation (I know you are being silly, so am I)

Selection is handled by asynchronous events which populate the is_dead() boolean.

Critiquing my own code, though, it should really be a check against 'can_reproduce()' rather than 'is_dead()'.