def create_default_groups(self):
        for group in self.groups:
            group = group.replace(" ", "_").lower()
            self[group] = NamedRequirements(group)
def visitdir(self, dir):
        dir = normalizerootdir(dir, "visitdir")
        if dir == "":
            dir = self._path
        else:
            dir = self._path + "/" + dir
        return self._matcher.visitdir(dir)