code: def update_todo_list(self, list_id, name, description, milestone_id=None,
          private=None, tracked=None):
          
          path = '/todos/update_list/%u' % list_id
          req = ET.Element('request')
          list_ = ET.SubElement('list')
          ET.SubElement(list_, 'name').text = str(name)
          ET.SubElement(list_, 'description').text = str(description)
          if milestone_id is not None:
              ET.SubElement(list_, 'milestone_id').text = str(int(milestone_id))
          if private is not None:
              ET.SubElement(list_, 'private').text = str(bool(private)).lower()
          if tracked is not None:
              ET.SubElement(list_, 'tracked').text = str(bool(tracked)).lower()
          return self._request(path, req)
docs: With this call you can alter the metadata for a list.