[Blender Python] How to apply a driver to a compositor node (video explinaiton here https://www.skool.com/cgpython/how-to-add-drivers-to-node-group-sockets-using-python?p=71dfec91 )

apply_driver_to_blur_node_size_y.py

"""prerequisite: you have a group node in the compositor, and inside the group node you have a Blur node""

import bpy

tree = bpy.context.scene.node_tree

driver = tree.nodes['Group'].node_tree.nodes['Blur'].driver_add("size_y").driver

driver.type = 'AVERAGE'

var = driver.variables.new()
var.name = "default_value"

var.targets[0].id_type = 'SCENE'
var.targets[0].id = bpy.context.scene
var.targets[0].data_path = 'node_tree.nodes["Group"].inputs[0].default_value'