advent_of_code/2022/3/3_2.py

#!/usr/bin/env python
# 2022 - Advent Of Code 3 - part1

# file = 'input_example.txt'
file = 'input.txt'

prio = 0


def find_common(b1, b2, b3):
    common1 = set(b1).intersection(b2)
    common2 = set(b1).intersection(b3)
    common_all = common1.intersection(common2)
    print(f"c1: {common1} c2: {common2} -> {common_all}")
    return list(common_all)


def convert_score(lnum):
    num = ord(lnum[0])
    if num > 90:  # lower case
        return num - 96
    return num - 64 + 26


with open(file, encoding="utf-8") as f:
    while line := f.readline():
        bag1 = line
        bag2 = f.readline().strip()
        bag3 = f.readline().strip()
        prio += convert_score(find_common(bag1, bag2, bag3))

print(prio)