docs: def update_event(self, event, uid):
          """Edit event
  
          Parameters
          ----------
          event : iCalendar file as a string
          (calendar containing one event to be updated)
          uid : uid of event to be updated
          """
          ev_for_change = self.calendar.get(uid)
          ev_for_change.content = event
          ev_for_change.save()