Untitled

About threads and callbacks
import threading

def cb_func(data):
    """The callback function"""
    print data

def th_func(callback):
    """The threaded function"""
    # do some work here
    callback('somedata')

thr = threading.Thread(target=th_func, args=(cb_func,)).start()

import threading

def cb_func():
    "The callback function."
    print 'Callback, in thread %s' % threading.current_thread().name

def th_func(callback):
    "The threaded function."
    # ...
    callback()

thr = threading.Thread(target=th_func, args=(cb_func,)).start()

Callback, in thread Thread-1`