I've spent far too long googling for this answer. :)
This same node group is used by multiple users (i.e., different objects in the scene use the same node group to generate their materials), but with different inputs. So a different object might look like this:
I then load the scene from the command line like this:
/my/blender/exec/blender -b /my/blender/file.blend -P /my/blender/script.py
/my/blender/script.py file, I want to be able to determine the input values (color or glossiness) of the node group for each user (object). I've found how to access the node group itself and explore its structure and default values programmatically, but I can't get the specific values being used for each user/object.
Any help you could offer would be most appreciated! First question on stack exchange... hope it goes well. :)
P.S. Blender 2.78, in case it's helpful.