docs: def to_reminders(self, ical, label=None, priority=None, tags=None,
                       tail=None, sep=" ", postdate=None, posttime=None):
          """Return Remind commands for all events of a iCalendar"""
          if not hasattr(ical, 'vevent_list'):
              return ''
  
          reminders = [self.to_remind(vevent, label, priority, tags, tail, sep,
                                      postdate, posttime)
                       for vevent in ical.vevent_list]
          return ''.join(reminders)