get the size of current screen in i3wm

i3-get-current-screen.py

#!/usr/bin/env python
import i3

def getCurrentScreen():
    workspace = [ws for ws in i3.get_workspaces() if ws['focused']][0]

    screen_w =str(workspace['rect']['width'])
    screen_h =str(workspace['rect']['height'])

    print(screen_w, screen_h);

getCurrentScreen();