I have tried both open(filename, 'r') and open(filename, 'rb')

I can get the file loaded into a string and then try
print binascii.crc32(file-in-string)

Still just gives me negative integers,...

I instead used a crc32.c script for use with subprocess .. Faster, and easier ..

http://dev.jmoiron.net/code/html/cksum.py.html

Can I use this code example to write a more simple approach?

I would prefer it in a single function, but the classes and etc. confuses me, I think...

Can you define this method? I am not sure I understand what you mean.

import binascii
def getCRC(filename):
filedata = open(filename).read()
return binascii.crc32(filedata)

So far i've got this and it returns something like:

-2087276233
import binascii
def getCRC(filename):
filedata = open(filename).read()
return binascii.crc32(filedata)

Someone told...