def del_old_events(service, cal_id, term):
"""Delete all the events previously created, in the secondary calendar,
in order to sustain an eventual update."""
semester_dates, _ = get_academic_dates(term)
first_day, last_day = semester_dates
last_day = last_day + timedelta(days=1)
# Get datetime range of the first week of the semester.
dt_min = datetime(first_day.year, first_day.month, first_day.day,
tzinfo=TIMEZONE)
dt_max = datetime(last_day.year, last_day.month, last_day.day,
tzinfo=TIMEZONE)
# Create a list of all the events we need to delete.
old_events_list = service.events().list(
calendarId=cal_id,
timeMin=dt_min.isoformat(),
timeMax=dt_max.isoformat()).execute()
old_recur_events = []
for old_event_id in old_events_list:
old_recur_events.append(
service.events().instances(calendarId=cal_id,
eventId=old_event_id,
timeMin=dt_min.isoformat(),
timeMax=dt_max.isoformat()).execute())
for summ in old_recur_events:
for ite in summ['items']:
service.events().delete(calendarId=cal_id,
eventId=ite['id']).execute()
def first_last_day_semester(semester, day_of_the_week):
"""Get first and last day of a specific course during a semester.
Returns a tuple with the fist day as a datetime.date objects and
the last day as a string of the form YYYYmmdd."""
# First day of the semester
semester_dates = get_academic_dates(semester)
first_day_semester, last_day_semester = semester_dates
last_day_semester = last_day_semester + timedelta(days=1)
# Get first day of the academic year a specific course is given.
relative_day_add = rdelta.relativedelta(weekday=day_of_the_week)
day = first_day_semester + relative_day_add
return (day, last_day_semester.strftime("%Y%m%d"))
