def do_render_group group pass def render_groups self lst def get_grou

def do_render_group(group):
    pass

def render_groups(self, lst):
    def get_group():
        last = None
        res = []
        for obj in lst:
            if obj.grp != last:
                yield res
                last, res = obj.grp, []
            res.append(obj)
        yield res
    if lst:
        map(do_render_group, get_group())