calc_avg_comet.py

import sys


with open(sys.argv[1], 'r') as f:
    lines = [line.strip() for line in f]

scores = [float(line.split()[-1]) for line in lines]

with open(sys.argv[1], 'a') as f:
    f.write(f'Average score: {sum(scores) / len(scores) * 100:.2f}\n')