def __init__(self, groups=None):
        super(GroupedRequirements, self).__init__(NamedRequirements)
        self.groups = groups or self.default_groups
        self.filename = None
        self.create_default_groups()
def _nearest_weekday(weekday):
    return datetime.now() + timedelta(days=(weekday - datetime.now().weekday()) % 7)