6_1.py

   1 """Simulate lanternfish pop growth"""
   2
   3 with open("6_input.txt") as f:
   4     fishes = [int(x) for x in f.read().split(",")]
   5
   6 for day in range(256):
   7     print(day)
   8     for i in range(len(fishes)):
   9         if fishes[i] == 0:
  10             fishes[i] = 6
  11             fishes.append(8)
  12         else:
  13             fishes[i] -= 1
  14
  15 print(len(fishes))