I'm trying to write a program to get the artist and album from mp3 files. A simple test run on the Alice in Chanins song Rooster yielded this result -> b'Rooster\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
I set read to read(20) and if you count Rooster plus all the \x00s you'll see that it 20, I'm confused because that chould be 20 bytes and \x00 is 4 bytes. I need to be able to tell the program to stop building the artist string after it hits \x00, how can represent that? Thanks.

\x00 is byte, not 4, you can strip those with .rstrip('\x00')

>>> b'Rooster\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
>>> _.rstrip('\x00')

I need to make sure that file.read() stops after hitting '\x00' I tried a while loop but it isn't working. Also, does file.read() step one byte forward each time through a loop or do I need to manually move the pointer? Thanks.

#!/usr/bin/env python3

import sys

file = sys.argv[1]
f = open(file, 'rb')

f.seek(-125, 2)
artist = f.read()
char = f.read()
while char is not '\x00':
    char = f.read(1)
    artist = artist + f.read()