Migrera py2 till py3

class MapString:
    def __init__(self, channelid, titleRegex, strm, src):
        self.channelid = channelid
        self.titleRegex = titleRegex
        self.strm = strm
        self.src = src

    @staticmethod
    def Parse(xmlstr, logCall=deb):
        rstrm = ''
        categories={}
        if logCall:
            logCall('[UPD] Parse map file')
        io = io.StringIO(xmlstr)
        context = ElementTree.iterparse(io, events=("start", "end"))
        event, root = next(context)
        elements_parsed = 0
        if logCall:
            logCall('[UPD] %-35s %-50s %s' % ('ID' , 'TITLE_REGEX', 'STRM'))
        result = list()
        for event, elem in context:
            if event == "end":
                if elem.tag == "channel":
                    aid    = elem.get("id")
                    atitle = elem.get("title")
                    astrm  = elem.get("strm")
                    if logCall:
                        logCall('[UPD] %-35s %-50s %s' % (aid, atitle, astrm))
                    result.append(MapString(aid, atitle, astrm, ''))
                if elem.tag == "map":
                    rstrm = elem.get("strm")
                if elem.tag == "category":
                    category_tags_set = set()
                    category_name = elem.get("name")
                    category_tags = elem.get("tags").split('|')
                    for tag in category_tags:
                        category_tags_set.add(('' + tag))
                    categories[category_name] = category_tags_set
        #if logCall:
            #logCall('\n')
            #if rstrm != '':
                #logCall('[UPD] Stream rule = %s' % rstrm)
        return [result, rstrm, categories]