How to use the icalendar.Calendar function in icalendar

def MakeTimes(dates):
    """Send a message when the command /GetTimes is issued."""
    """update.message.reply_text('Times!')"""

    i = 0
    timeSpanBeginDate = ""
    calendar_event = None
    icalString = []

    cal = Calendar()
    cal['summary'] = 'Playstation 4 Playtime'

    while i < len(dates):

        if (i == 0):
            print("First element")
            timeSpanBeginDate = dates[i]
        elif (isBeginOfTimespan(dates[i - 1], dates[i])):
            print("Timespan Begin ")
            calendar_event = None
            timeSpanBeginDate = dates[i]
        elif (i + 1 == len(dates)):
            print("Last Element")
            calendar_event = getIcalDate(timeSpanBeginDate, dates[i])
        elif (isBeginOfTimespan(dates[i], dates[i + 1])):
            print("Timespan End ")

def parse(ical):
    cal = Calendar.from_ical(ical)
    map = {}
    for event in cal.walk('vevent'):
        date = event.get('dtstart')
        summary = event.get('summary')
        categories = event.get('categories')
        if categories in ['Blue Day', 'Red Day', 'Anchor Day']:
            print("{} {} {}".format(date.to_ical(), summary, categories))
            map[date.to_ical()] = str(summary)

    return map

def parties_ical(parties, summary="Upcoming Cryptoparties"):
    """
    ical feed for all upcoming
    
    TODO: it'd be nice if we could generate location-based feeds
     i.e. give me an iCal feed of all events within 50km of [city]
    """
    cal = icalendar.Calendar()
    cal["summary"] = summary
    for party in parties:
        event = icalendar.Event()
        event.add('uid', party.id)
        event.add('dtstart', party.time)
        event.add('summary', party.description)
        event.add('location', party.street_address)
        event.add('url', party.additional_info)
        # TODO: add titles here
        cal.add_component(event)
    return Response(cal.to_ical(), mimetype="text/calendar")

def open_cal():
    if os.path.isfile(filename):
        if file_extension == 'ics':
            print("Extracting events from file:", filename, "\n")
            f = open(sys.argv[1], 'rb')
            gcal = Calendar.from_ical(f.read())

            for component in gcal.walk():
                event = CalendarEvent("event")
                if component.get('SUMMARY') == None: continue #skip blank items
                event.summary = component.get('SUMMARY')
                event.uid = component.get('UID')
                if component.get('DESCRIPTION') == None: continue #skip blank items
                event.description = component.get('DESCRIPTION')
                event.location = component.get('LOCATION')
                if hasattr(component.get('dtstart'), 'dt'):
                    event.start = component.get('dtstart').dt
                if hasattr(component.get('dtend'), 'dt'):
                    event.end = component.get('dtend').dt


                event.url = component.get('URL')

def construct_icalendar(context, events):
    """Returns an icalendar.Calendar object.

    :param context: A content object, which is used for calendar details like
                    Title and Description. Usually a container, collection or
                    the event itself.

    :param events: The list of event objects, which are included in this
                   calendar.
    """
    cal = icalendar.Calendar()
    cal.add('prodid', PRODID)
    cal.add('version', VERSION)

    cal_tz = default_timezone(context)
    if cal_tz:
        cal.add('x-wr-timezone', cal_tz)

    tzmap = {}
    if not getattr(events, '__getitem__', False):
        events = [events]
    for event in events:
        if ICatalogBrain.providedBy(event) or\
                IContentListingObject.providedBy(event):
            event = event.getObject()
        if not (IEvent.providedBy(event) or IOccurrence.providedBy(event)):
            # Must be an event.

def process(self, email):

        current_app.logger.info(f'attempting to process email {email["Subject"]}')

        msg = None
        info = None
        result = False
        for part in email.walk():
            if part.get_content_type().startswith('multipart'):
                for subpart in part.get_payload():
                    if subpart.get_content_type() == 'text/calendar':
                        try:
                            # some payloads are base64 encoded...
                            msg = base64.b64decode(subpart.get_payload())
                            msg = icalendar.Calendar.from_ical(msg)
                        except ValueError:
                            # ... and some aren't
                            msg = subpart.get_payload()
                            msg = icalendar.Calendar.from_ical(msg)
                        break
        
        if not msg:
            return False

        for event in msg.subcomponents:
            if event.name == 'VEVENT':
                info = event

        if not info:
            return False

def createCalendarData(self, ownerId=None, ownerType=None, permissions=None, data=None):
        if ownerId is None:
            logWarning("NO OWNER ID WAS GIVEN WHEN ATTEMPTING TO LOOK UP CALENDAR")
            return None
        if data is None: data = Calendar().to_ical()
        result = self.DB_BRIDGE.getCalendarFromOwnerId(ownerId)
        if result is None:
            result = DBCalendarData()
        result.setCalendarData(ownerId, ownerType, permissions, data)
        result.saveToDB()
        return result

def getICalObject(self):
        return Calendar.from_ical(self.calendarData)

file_path = os.path.join(self.path, filename)
                if os.path.isfile(file_path):
                    stat = os.lstat(file_path)
                    last_updated = datetime.fromtimestamp(stat.st_mtime, tz=utc)

                    if self.is_latest_content(last_updated, provider.get('last_updated')):
                        if NTBEventXMLFeedParser and isinstance(registered_parser, NTBEventXMLFeedParser):
                            logger.info('Ingesting xml events')
                            with open(file_path, 'rb') as f:
                                xml = ElementTree.parse(f)
                                parser = self.get_feed_parser(provider, xml.getroot())
                                item = parser.parse(xml.getroot(), provider)
                        elif isinstance(registered_parser, IcsTwoFeedParser):
                            logger.info('Ingesting ics events')
                            with open(file_path, 'rb') as f:
                                cal = Calendar.from_ical(f.read())
                                parser = self.get_feed_parser(provider, cal)
                                item = parser.parse(cal, provider)
                        else:
                            logger.info('Ingesting events with unknown parser')
                            parser = self.get_feed_parser(provider, file_path)
                            item = parser.parse(file_path, provider)

                        self.after_extracting(item, provider)
                        self.move_file(self.path, filename, provider=provider, success=True)

                        if isinstance(item, list):
                            yield item
                        else:
                            yield [item]
                    else:
                        self.move_file(self.path, filename, provider=provider, success=True)