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Description:

powertop 0.2.2

A wrapper to use PowerTOP easily in
Python.
Also provides a command to get the results as JSON.

Install

install PowerTOP (e.g. sudo aptitude install powertop on
Debian-based distributions)
sudo python3 -m pip install powertop

Short example
Run as root, in a Python 3 shell:
import powertop
import json

measures = powertop.Powertop().get_measures(time=1)

print(json.dumps(measures['Device Power Report'], indent=4))
Or, as a shell command:
sudo python3 -m powertop
Outputs:
[
{
"Usage": "66.4%",
"Device Name": "CPU core"
},
{
"Usage": "66.4%",
"Device Name": "DRAM"
},
{
"Usage": "66.4%",
"Device Name": "CPU misc"
},
{
"Usage": "18.8 ops/s",
"Device Name": "GPU misc"
},
{
"Usage": "18.8 ops/s",
"Device Name": "GPU core"
},
...

How to use
First, call PowerTOP:
import powertop

measures = powertop.Powertop().get_measures(time=1, iterations=1)

Sections
You can then access sections. They may vary across systems and PowerTOP
versions.
On my computer, they are:

Top 10 Power Consumers
Processor Idle State Report
Processor Frequency Report
Overview of Software Power Consumers
Device Power Report
Process Device Activity
Software Settings in Need of Tuning
Untunable Software Issues
Optimal Tuned Software Settings

You can find yours with this command:
sudo python3 -c "import powertop; measures = powertop.Powertop().get_measures(time=1); print(measures.keys())"

Reading sections
Each section is a list JSON-like data (strings, lists and dicts).
Run sudo python3 -m powertop to get a taste of what it looks like.