Way to find out people who have not attended a microsoft teams session given a list of their usernames, and the CSV generated by Teams

list_generation_helper.py

import pandas as pd
from sys import argv

if __name__ == "__main__":
    n = len(argv)
    if n != 2:
        print("usage: python3 attendance.py <name_of_file>")
        exit(1)

    set_of_all = set()
    b1 = set()

    with open("all_students.txt", "r") as fp:
        for line in fp:
            set_of_all.add(line.rstrip())
    for x in set_of_all:
        print(x)
        what = input()
        if what.rstrip() == "Y":
            b1.add(x)

    with open('batch.txt', 'w') as fo:
        for x in b1:
            print(x, file = fo)

teams_attendance.py

from sys import argv

if __name__ == "__main__":
    n = len(argv)
    if n != 3:
        print("usage: python3 attendance.py <batch_file> <name_of_file>")
        exit(1)

    __, batch, attendance = argv

    set_of_all = set()

    with open(batch, "r") as fp:
        for line in fp:
            set_of_all.add(line.rstrip())


    attendance_data = pd.read_csv(attendance, encoding = 'utf-16', delimiter = '\t')

    todays_attendees = set(sorted(list(attendance_data['Full Name'])))

    absent = set_of_all - todays_attendees

    print(sorted(list(absent)))