If you have a problems with the urrlib2 after upgrading Pi or a fresh install try install urllib3 with pip
sudp pip install urrlib3

I made som redesigns in my script with error correction
my S0Meter needs a 2% correction
my current version


#!/usr/bin/env python

import RPi.GPIO as GPIO
import ...

I rewrote the code, I wanted not only the counter but also the current power
At startup i read the last value from domoticz

The code puts a pullup resistor in
GPIO.setmode(GPIO.BCM)
GPIO.setup(13, GPIO.IN, pull_up_down = GPIO.PUD_DOWN)

This topic describes to connect the cheap DDS238-1 S0 pulse energy meter (without the RS485 that is the DDS238-1ZN) direct to the raspberry GPIO
I could not find a topic for the simple S0 energy meter

Aliexpress https://nl.aliexpress.com/item/5-32-A-230V-50HZ-Single-phase-Din-rail-KWH-Watt-hour-din ...