How to use the memacs.lib.reader.CommonReader.get_data_from_url function in memacs

def _main(self):
        # getting data
        if self._args.calendar_file:
            data = CommonReader.get_data_from_file(self._args.calendar_file,
            encoding=None)
        elif self._args.calendar_url:
            data = CommonReader.get_data_from_url(self._args.calendar_url)

        # read and go through calendar
        cal = Calendar.from_ical(data)
        for component in cal.walk():
            if component.name == "VCALENDAR":
                self.__handle_vcalendar(component)
            elif component.name == "VEVENT":
                self.__handle_vevent(component)
            else:
                logging.debug("Not handling component: " + component.name)

def _main(self):
        """
        get's automatically called from Memacs class
        """
        # getting data
        if self._args.file:
            data = CommonReader.get_data_from_file(self._args.file)
        elif self._args.url:
            data = CommonReader.get_data_from_url(self._args.url)

        rss = feedparser.parse(data)
        logging.info("title: %s", rss['feed']['title'])
        logging.info("there are: %d entries", len(rss.entries))

        for item in rss.entries:
            logging.debug(item)
            output, note, properties, tags, timestamp = \
                self.__get_item_data(item)
            self._writer.write_org_subitem(output=output,
                                           timestamp=timestamp,
                                           note=note,
                                           properties=properties,
                                           tags=tags)