aocday8.py

import csv
from collections import Counter

def get_table(m):
    invert_counter = {v: i for i, v in Counter(''.join(m)).items()}
    digit_table = {
        'e': invert_counter[4],
        'b': invert_counter[6],
        'f': invert_counter[9],
    }
    def rm_from_str(s):
        return s.translate(str.maketrans('', '', ''.join(digit_table.values())))
    
    digit_table['c'] = rm_from_str(m[0])
    digit_table['a'] = rm_from_str(m[1])
    digit_table['d'] = rm_from_str(m[2])
    digit_table['g'] = rm_from_str(m[-1])
    return {v: i for i, v in digit_table.items()}

with open('input8.txt') as file:
    content = file.readlines()
    digit_list = ['abcefg', 'cf', 'acdeg', 'acdfg', 'bcdf', 'abdfg', 'abdefg', 'acf', 'abcdefg', 'abcdfg']
    inverted_digit_list = {v: str(i) for i, v in enumerate(digit_list)}

    numbers = [int(''.join(
                    inverted_digit_list[''.join(sorted(w.translate(str.maketrans(get_table(tuple(sorted(sorted(["".join(sorted(list(s))) for s in in_str.split(" ")], key= lambda x: x[0]), key=len)))))))] 
                    for w in tuple("".join(sorted(list(s))) for s in out_str.split(" "))))
                for in_str, out_str in (row.strip().split(' | ') for row in content)]
    print(sum(numbers))