project_euler_67.py

#!/usr/bin/env python
from __future__ import print_function
import sys

if sys.version_info.major >2:
    xrange = range

last = []
with open("numbers", "r") as fandle:
    for line in fandle:
        current = [int(num_str) for num_str in line.split(' ')]

        current_len = len(current)

        if current_len == 1:
            last = current
            continue

        for i in xrange(current_len):
            if i == 0:
                current[i] += last[0]

            elif i == current_len - 1:
                current[i] += last[-1]

            else:
                current[i] += max(last[i-1:i+1])

        last = current

print(max(last))