Threaded decorator for kivy with callback

threaded_decorator.py

import threading
from kivy.clock import mainthread

def threaded(callback):
  def _threaded(f):
    def _threaded_callback(*args, **kwargs):
      def _run_in_threaded_callback(*args, **kwargs):
        ret = f(*args, **kwargs)
        mainthread(callback)(ret)
      thread = threading.Thread(target=_run_in_threaded_callbacks, args=args, kwargs=kwargs)
      thread.daemon = True
      thread.start()
    return _threaded_callback
  return _threaded


# example
def on_compute_done(result):
  print result

@threaded(on_compute_done)
def compute():
  import time
  time.sleep(5)
  return "hello"