absent.py

import sys

if len(sys.argv) != 3:
    print('Usage: absent.py all.txt meet.txt')

fn_all, fn_meet = sys.argv[1:]

with open(fn_meet) as meet:
    participants = meet.read().splitlines()

with open(fn_all) as all_:
    all_ = all_.read().splitlines()

participants_ = ' '.join(a.strip() for a in participants).lower()


for s in all_:
    rec = s.split(maxsplit=3)  # П І Б частина
    surname, *_, unit = rec
    
    if surname.lower() not in participants_:
        print(f"{' '.join(rec[:3])}, {unit}")