Render finished script

Question

I'm looking to write a script to print a message when the render is done.

if bpy.app.handlers.render_complete == True:
    print("\a") # beep
    print("Render complete!")

only that doesn't work when the render is finished.

I tried wrapping it in app handler but I just got errors

import os
import bpy
from pycl import print
from bpy.app.handlers import persistent

# clear the screen
os.system('cls')

@persistent

def my_handler(scene):
    print("\a") # beep
    print("Render done!!")

bpy.app.handlers.render_complete.append(my_handler)

Traceback (most recent call last): File "\Text", line 15, in my_handler File "C:\Program Files\Blender Foundation\Blender 2.91\2.91\scripts\addons\pyc l.py", line 33, in print console_print(*args, **kwargs) # to Python Console File "C:\Program Files\Blender Foundation\Blender 2.91\2.91\scripts\addons\pyc l.py", line 20, in console_print for a in context.screen.areas: AttributeError: 'NoneType' object has no attribute 'areas'

I've had a look at this post. Without a greater understanding of app handler, I'm not sure where I'm going wrong.

I've restarted Blender a couple of times and now have found that it was

from pycl import print

causing the error, simply removing it or commenting it out the script works fine.