Bending body part via script

I am trying to write this bit of code, but cannot find any references to acceptable syntax. I would like to do the following:

While having Genesis 2 Female selected (or any part of her body), I would like to bend her forearm, say 16.5 units. So I need to be able to tell the script that G2F is selected, find her left forearm, get it's current z rotation and assign that to a variable.

Please help. The current documentation is incomplete, and I don't know what to do or where to find some examples.

Thanks,
Slosh