How do I find the decibel level of the audio of my computer in python?

I was wondering if I could have some help figuring out how to check the decibel level of my computer audio. I would like to make a program that finds the desired decibel level of my volume, and if my volume is above that, moves it down. I have included some code that outlines what I would like:

Import decibelget

while True:

vol = decibelget.get()

if vol<36:
    vol = vol + 1

if vol>36:
    vol = vol + 1