code: def modify_calendar_resource(self, calres, attrs):
          
          attrs = [{'n': k, '_content': v} for k, v in attrs.items()]
          self.request('ModifyCalendarResource', {
              'id': self._get_or_fetch_id(
                  calres, self.get_calendar_resource),
              'a': attrs
          })
docs: :param calres: a zobjects.CalendarResource
          :param attrs:    a dictionary of attributes to set ({key:value,...})