day7.py

#!/bin/python

with open('day7.txt') as f:
    crabs = list(map(int, next(f).strip().split(',')))

pl, ph = min(crabs), max(crabs)+1
fn1 = list(range(ph))
fn2 = {num: num*(num+1)//2 for num in range(ph)}

def opt(fn):
    return min(sum(fn[abs(tp-cp)] for cp in crabs) for tp in range(pl, ph))

print('Minimum fuel required part one:', opt(fn1))
print('Minimum fuel required part two:', opt(fn2))