ghPython Node access data tree objects

How do I access the individual geometry inside of a data tree when it is passed into a python node? I would like to iterate based on the index of the list as expected in normal python code but it does not seem to work. I know how to do this with a bunch of gh nodes but essentially trying to shorten and cleanup the messy nodes and strings by combing whenever possible into a python node. Attached is just a simple example of using lines and the subdivide nodes.

Thanks, any help is appreciated!

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If this is Rhino 6, you can use treehelpers, (added to deal with this situation) Try this in the component that is red in your image. (change the x input to List Access and remove the Flatten from Line Component.).

import rhinoscriptsyntax as rs
import ghpythonlib.treehelpers as th

t = []

for c in x:
     t.append(rs.DivideCurve(c, y))

a = th.list_to_tree(t, False)