window resize script for XFCE (Xubuntu), depends on wmctrl

w_resize.py

#!/usr/bin/env python3
import subprocess
import sys

arg = sys.argv[1]
WA_correction = 48

def get(command):
    return subprocess.check_output(["/bin/bash", "-c", command]).decode("utf-8")

def execute(command):
    subprocess.Popen(["/bin/bash", "-c", command])

xprop_data = get("xprop -root").split()
w_id = xprop_data[xprop_data.index("_NET_ACTIVE_WINDOW(WINDOW):")+4].replace(",", "")
frontmost = w_id[:2]+"0"+w_id[2:]
w_data = [l for l in get("wmctrl -lG").splitlines() if frontmost in l][0].split()
new_G = w_data[2:6]
new_G[1] = str(int(int(new_G[1])-WA_correction))
if arg == "left":
    new_G[2] = str(int(int(new_G[2])/2))      
elif arg == "right":
    new_G[0] = str(int(int(new_G[0])+int(new_G[2])/2))    
    new_G[2] = str(int(int(new_G[2])/2))
elif arg == "up":
    new_G[3] = str(int(int(new_G[3])/2))
elif arg == "down":
    new_G[1] = str(int(int(new_G[1]) + int(new_G[3])/2))
    new_G[3] = str(int(int(new_G[3])/2))

execute("wmctrl -r :ACTIVE: -b remove,maximized_vert,maximized_horz")
execute("wmctrl -ir "+frontmost+" -e 0,"+(",").join(new_G))

see description here: http://askubuntu.com/a/576694/72216 on Askubuntu