Make DataTree with Python in Grasshopper

gistfile1.py

import Rhino
import scriptcontext


# for accesssing GH classes
import clr
clr.AddReference("Grasshopper")
from Grasshopper.Kernel.Data import GH_Path
from Grasshopper import DataTree

# make a DataTree and declare the data type it contains
geometryTree = DataTree[object]()

for i in range(len(points)):
    point = points[i]
    # make a path for each branch you want to create
    path = GH_Path(i)
    # this next line adds a list (I create a list of one point)
    # to the DataTree using AddRange()
    geometryTree.AddRange([point], path)
    # you could also use Add() to add a single item to a path
a = geometryTree