Python - Struggling With Data Trees/Iterating Nested Lists

[AndersDeleuran]

@michaelvollrath

However, I’m stuck on understanding how to loop within a tree in a basic sense…

Just in case you missed it, the McNeel documentation covers the basics:

Grasshopper data trees and Python

And if you want to dig a bit deeper, have a look here.

Tree operations in Python

There’s also the documentation of the DataTree class itself: https://developer.rhino3d.com/wip/api/grasshopper/html/T_Grasshopper_DataTree_1.htm And some minimal examples for reading and writing two dimensional trees: Read: """ Read the Grasshopper Datatree "FooTree" and translates it to a nested Python list """ pyList = [list(b) for b in FooTree.Branches] Write: import Grasshopper as gh def listToTree(nestedList): """ Convert a nested python iterable to a datatree """ …