How to use the pyregion.parser_helper.Global function in pyregion

                                          lambda s, l, tok: Global(tok[-1]))

def convert_attr(self, l):
        global_attr = [], {}

        parser = Ds9AttrParser()

        for l1, c1 in l:
            if isinstance(l1, Global):
                for kv in parser.parse_default(l1.text):
                    if len(kv) == 1:
                        global_attr[0].append(kv[0])
                    elif len(kv) == 2:
                        if kv[0] == 'tag':
                            global_attr[1].setdefault(kv[0], set()).add(kv[1])
                        else:
                            global_attr[1][kv[0]] = kv[1]

            elif isinstance(l1, Shape):
                if c1:
                    attr_list = parser.parse_default(c1)
                    attr0, attr1 = get_attr(attr_list, global_attr)
                else:
                    attr0, attr1 = global_attr
                l1n = copy.copy(l1)