Code for the Extended tutorial video "Easily Create Driver Variables with Blender Python" ( https://www.skool.com/cgpython/classroom/e707bee7?md=b48bf615d1a5465fb6835c4a98d2aa8b )

create_blender_driver_variables_extended.py

import bpy

def add_icosphere():
    bpy.ops.mesh.primitive_ico_sphere_add()
    return bpy.context.active_object


def add_empty():
    bpy.ops.object.empty_add()
    return bpy.context.active_object


def set_up_driver(driver_fcurve_obj, target_obj):
    driver_obj = driver_fcurve_obj.driver

    my_var = driver_obj.variables.new()
    my_var.name = "py_var2"
    my_var.targets[0].id = target_obj
    my_var.targets[0].data_path = "location.z"

    driver_obj.expression = f"{my_var.name} * 0.5"


def main():
    ico_sphere_obj = add_icosphere()
    empty_obj = add_empty()

    driver_fcurve_objs = ico_sphere_obj.driver_add("location")

    for driver_fcurve_obj in driver_fcurve_objs:
        set_up_driver(driver_fcurve_obj, empty_obj)

main()