import functools
import threading

def thread(func, after, *args, **kwargs):
    func = functools.partial(func, *args, **kwargs)
    call = lambda after, func: after(func())
    t = threading.Thread(
        target = call, 
        args = (after, func)
    )
    t.start()

def get_missing(required, provided):
    return list(filter(lambda item: item not in provided, required))