Parent specific objects to empty with python?

Question

So basically i have a few cubes in my scene, i want to parent all the thin cubes to the empty in python, i know i would start with a sort of detection system in python to detect which cubes to select, however i have scene other answers on this topic syaing to just add child_of constraint, this will not work for me, is there a way to parent these objects to the empty properly in python?

Answer 1

This script uses the height of the "thin" cubes as condition to select them. In this case I've set the THRESHOLD_HEIGHT to 0.9 but adjust this value if need be. (I'm assuming that your cubes have a dimension of 2 meters)

import bpy

THRESHOLD_HEIGHT = 0.9

parent_obj = bpy.data.objects["Empty"]

bpy.ops.object.select_all(action='DESELECT')

for obj in bpy.data.objects:
    if obj.type == 'MESH' and obj.dimensions.z < THRESHOLD_HEIGHT:
        obj.select_set(True)

parent_obj.select_set(True)

bpy.context.view_layer.objects.active = parent_obj

bpy.ops.object.parent_set(type='OBJECT')

If you want to base the selection algo of the "thin" cubes based on their name you can use this type of selection loop:

for obj in bpy.data.objects:
    if "thin_" in obj.name and obj.type == 'MESH':
        obj.select_set(True)