I’ve started learning Python (albeit slowly) and pretty much recommend any tech artist/animator/rigger to do so to! It’s awesome and the sheer number of libraries and packages using it is crazy:
3ds Max – http://forums.cgsociety.org/showthread.php?f=98&t=816475
Motionbuilder – http://en.wikipedia.org/wiki/Motionbuilder
Maya – http://en.wikipedia.org/wiki/Autodesk_Maya
Softimage – http://en.wikipedia.org/wiki/Autodesk_Softimage
Cinema 4d – http://www.py4d.com/
Lightwave – http://www.newtek.com/lightwave/core/techfaq.php
Houdini – http://www.sidefx.com/index.php?option=com_content&task=view&id=1029&Itemid=266
Modo – http://www.luxology.com/modo/product_information/technical_specifications/