'Handler called after the task returns.
Arguments:
status (str): Current task state.
retval (Any): Task return value/exception.
task_id (str): Unique id of the task.
args (Tuple): Original arguments for the task.
kwargs (Dict): Original keyword arguments for the task.
einfo (~billiard.einfo.ExceptionInfo): Exception information.
Returns:
None: The return value of this handler is ignored.'

def after_return(self, status, retval, task_id, args, kwargs, einfo):

    pass
