Belkin Wemo discover switches and automatically subscribe to events. Needs the https://github.com/iancmcc/ouimeaux library to work.

Wemo-switch-v2.py

import datetime
from ouimeaux.environment import Environment

def on_switch(switch): #discover light switches and register listeners
    print('********  Switch found:'+ switch.name+ ', Current state : '+str(switch.get_state()))
    x = switch.name.replace(" ", "") #remove spaces
    x = env.get_switch(switch.name)
    x.register_listener(on_change)

def on_change(value):
    now = datetime.datetime.now() #.time()
    print(str(now.strftime("%d %B %Y at %I:%M%p"))+' *********  light was  switched! Switch: #####'+   ', Current state : ' +value)

env = Environment(switch_callback=on_switch, with_cache=False)

env.start()

env.discover(3)

env.wait()