aoc2018_12_part1.py

_=range
import re
f=open("input.txt")
C=lambda c:c<'.'
b=4*[0]
s=b+map(C,f.readline()[15:].strip())+b
m=dict((tuple(map(C,p)),C(r))for p,r in re.findall('([.#]+) => ([.#])',f.read()))
for g in _(20):s=b+[m[tuple(s[i:i+5])]for i in _(len(s)-5)]+b
print sum(i-44for i,x in enumerate(s)if x)