change_desktop_background.py

import subprocess
import re

command = ['qdbus', 'org.kde.plasmashell', '/PlasmaShell', 'org.kde.PlasmaShell.evaluateScript']
command.append("""
	var allDesktops = desktops();
	for (i=0;i<allDesktops.length;i++) 
	{
		d = allDesktops[i];
		d.wallpaperPlugin = "org.kde.image";
		d.currentConfigGroup = Array("Wallpaper", "org.kde.image", "General");
		d.writeConfig("Image", "file://%s");
	}
	""")

proc = subprocess.run(['acpi','-i'], stdout=subprocess.PIPE)
acpi_info = proc.stdout.decode('utf-8')

if re.search('Discharging',acpi_info):
	command[-1] = command[-1] % '/home/raghuram/Pictures/discharging.png'
elif re.search('Charging',acpi_info) or re.search('Full',acpi_info):
	command[-1] = command[-1] % '/home/raghuram/Pictures/charging.png'	
else:
	command[-1] = command[-1] % '/home/raghuram/Pictures/shrug.png'
	
subprocess.run(command)