silly little script for pairing things together in a CSV, used to pair a barcode and RFID card serial together

pair.py

import os
output_file = "card_pairs.csv"

magic_number = 4

if output_file not in os.listdir('.'):
    with open(output_file, "w") as f:
        f.write("id_number,card_serial\n")

while 1:
    a = input("scan card:")
    b = input("waiting for second input:")

    print("{} {}".format(a,b))

    if len(a) > magic_number:
        card_serial = a
        id_number = b
    else:
        card_serial = b
        id_number = a

    with open(output_file, "a") as f:
        f.write("{},{}\n".format(id_number,card_serial))