Problem with INF variable

Okay. I understood the code. I've reading my old Python book recently and wow, Python is so easy. It's amazing.

Well, even though I'm running this on Mac OS 10.5, I get a syntax error on line 65:

Sparragus:Desktop Sparragus$ python auto-ndis.py
  File "auto-ndis.py", line 65
    if ".inf" in Inf
                   ^
SyntaxError: invalid syntax

What could be wrong here?
Probably it's just the OS...but I haven't installed Ubuntu yet, but I swear I'm about to. Gimme a week. I really want to work on this project.

Also, could someone explain how does the branch thing works? Or where I could get info on it.

Later.