def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def _every_weekday(job, weekday, loop=None):
    return every(job, timedelta=timedelta(days=7), start_at=_nearest_weekday(weekday), loop=loop)