simple parser for cheap usb magnetic strip readers. this is aimed at the person who's simply curious about the data on the tracks of the strip.

msr_parser.py

while True:
    terminal_input = input("scan code:")
    if (terminal_input == None):
        break

    t1begin = terminal_input.find('%') + 1
    t1end = terminal_input.find('?;', t1begin)

    t2begin = terminal_input.find('?;') +2
    t2end = terminal_input.find('?;', t2begin)

    t3end = terminal_input.rfind('?')
    t3begin = terminal_input.rfind("?;", None, t3end) + 2


    if t1begin > 0 and t1end > t1begin:
        try:
            track1 = terminal_input[t1begin:t1end]
            print('Track 1: ' + track1)
        except:
            print('Track 1 READ ERROR')

    if t2begin > 0 and t2end > t2begin:
        try:
            track2 = terminal_input[t2begin:t2end]
            print('Track 2: ' + track2)
        except:
            print('Track 2 READ ERROR')

    if t3begin > 0 and t3end > t3begin:
        try:
            track3 = terminal_input[t3begin:t3end]
            print('Track 3: ' + track3)
        except:
            print('Track 3 READ ERROR')

    print('\n')