过滤来自 json 响应的结果，以仅显示没有结束日期的重复事件。 Python 和谷歌日历 API

Question

I'm using the Google Calendar API to get a list of Calendar events which are recurring and have no end date. I've been trying to filter the json response to only return recurring events in the recurrence field, this is an example: 'recurrence': ['RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20230112T235959Z;BYDAY=FR']

I want to filter out the response to not return events which have an end date. The UNTIL= part above means the recurring event will end in April. I only want the events to be returned if the recurrence field is like below: recurrence': ['RRULE:FREQ=WEEKLY;BYDAY=WE']

I've tried various ways to filter events with regex, substrings etc but nothing seems to work. I think a list comprehension may work here, but not sure how to go about it. Any help is appreciated. my code is below:

try:
    #call the calendar api to pull the recurring events from the resource calendar list
    page_token = None
    for el in cal_list:
        events = cal_service.events().list(calendarId=el, pageToken=page_token).execute()
        for event in events['items']:
            if 'recurrence' in event: **#return recurring events only, I've tested and this works**
                event_list.append(event)
    print(event_list)
    page_token = events.get('nextPageToken')

except HttpError as error:
    print('An error occurred: %s' % error)

I've tried using data.find() to find UNTIL= substring but it errors out. I tried using regex and it tells me it can only be used on a string.

I've tried if 'recurrence' in event and 'UNTIL=' not in event: and it errors out.

Answer 1

recurrence is a list of strings, so:

if 'recurrence' in event and 'UNTIL=' not in event['recurrence'][0]:
    ...

or to be precise:

if 'recurrence' in event and all('UNTIL=' not in r for e in event['recurrence']):
    ...