def create_future(state=PENDING, exception=None, result=None):
    f = Future()
    f._state = state
    f._exception = exception
    f._result = result
    return f
def create_future(state=PENDING, exception=None, result=None):
    f = Future()
    f._state = state
    f._exception = exception
    f._result = result
    return f