Lowering mouse sensitivity

I have tried to lower mouse sensitivity below 10 (lowest in-game), but it doesn’t work. I tried these steps: http://steamcommunity.com/app/49520/discussions/0/882960797527726404/

But everytime I type “whatever.py” 5 in cmd or in python I get this: invalid syntax with an arrow pointing at “5”.
Lowering windows sensitivity doesn’t work and my mouse doesn’t support lower DPI (800 is the lowest, which I am using right now).

How can I lower the sensitivity to say, for example, 5? I currently make 2.5 turn when doing a full mouse swipe, and I’d like that to be 0.75 turn.

EDIT: Also, this link: http://forums.gearboxsoftware.com/showthread.php?t=149113 doesn’t work anymore, anywhere I can access it?

EDIT #2: Now I get bytearray index out of range whenever I type something behind my python script (e.g. “whatever.py” 5

Thanks in advance!

FINAL EDIT #3: Nevermind! I’ve fixed it. This thread can be closed.