advent_of_code/2021/2/2.py

#!/usr/bin/env python
# 2021 - Advent Of Code - 2

import re

x = 0
y = 0

re_parse = re.compile(r'(forward|up|down) (\d+)')

with open('input.txt', encoding="utf-8") as f:
    for line in f:
        m = re_parse.match(line)
        direction, unit = m.group(1), int(m.group(2))
        if direction == 'up':
            y -= unit
        elif direction == 'down':
            y += unit
        elif direction == 'forward':
            x += unit

print(f'position: ({x}, {y}) => {x*y}')