blender_node_placer

node_placer.py

import bpy
def node_placer(parent_node):
    bottom_pos = [parent_node.location[0]-100-parent_node.width, parent_node.location[1]]
    for child_node in [link.from_node for socket in parent_node.inputs for link in socket.links]:
        child_node.location = bottom_pos
        bottom_pos[1] -= (parent_node.height +100)
        for ch_node in [link.from_node for socket in child_node.inputs for link in socket.links]:
            node_placer(child_node)
    return
node_placer(#output node object here)