dmenu window selection

#!/usr/bin/python
import os
import re

"""
    Go to window using dmenu.
    Requires wmctrl, xprop, and something I might have forgotten.
    Tested on Python 2.7.
"""

""" Returns the window class, give a window ID """
def get_window_class(id):
    xprop_wininfo = os.popen("xprop WM_CLASS -id " + id).read().split('\n')[:-1]
    return xprop_wininfo[0].split('"')[1]

window_list = os.popen("wmctrl -l").read().split('\n')[:-1]

# remove double spaces
window_list = [x.replace('  ', ' ') for x in window_list]

# a list of lists
window_list = [x.split(' ',3) for x in window_list]

# dict key: window name, value: window ID
id_dict = { x[3]:x[0] for x in window_list}

# get the classes of all windows
class_dict = {x:get_window_class(x) for x in id_dict.values()}

# combined dict:  name+class:id
win_dict = {}
for win_name in id_dict.keys():
    id = id_dict[win_name]
    new_name = win_name + " (" + get_window_class(id) + ")"
    new_name = re.sub(r'[\x80-\xff]', '', new_name).lower()
    win_dict[new_name] = id

# input for dmenu, newline separated
dmenu_in = '"' + '\n'.join(win_dict.keys()) + '"'

selection = os.popen("echo " + dmenu_in + " | dmenu").read()
win_id = win_dict[selection]
os.popen('wmctrl -i -a ' + win_id)