RV Player Python API | Get all source node attributes

I am trying to retrieve attributes of all the source nodes. Initially I tried using the rvc.nodeInfo but ti was showing that this method does not exist in rv.commands. Later on I came across rvc.sourceAttributes but the problem I am facing over here is it is giving me the attributes of only first source node and returning None for the others.

import rv.commands as rvc

source_nodes = rvc.nodesOfType("RVSourceGroup")
for node in source_nodes:

I also tried to set each node rvc.setViewNode(node) within the loop but still not getting any result. I would really appreciate it if anyone could guide me for the process to retrieve attributes for all the source nodes.