How to create a custom data tree?

[sadovshikov (Vitaly Sadovshchikov)]

Hi there! I am trying to create a custom data tree with one branch {0;1} and insert there a list of data. But apparently, I have written something wrong. Would you point out my mistake?

import Rhino
import Grasshopper as gh

t = ["a","b","c"]
path = gh.Kernel.Data.GH_Path(0,1)
tree = gh.DataTree 
gh.DataTree.Insert(tree,t,path,0)

[AndersDeleuran]

You probably want the AddRange method, see an example here. Also Giulio’s link further up to the official McNeel GHPython DataTree docs:

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 """ …