code: def list_joined_groups(self, user_alias=None):
          
          xml = self.api.xml(API_GROUP_LIST_JOINED_GROUPS % (user_alias or self.api.user_alias))
          xml_results = xml.xpath('//div[@class="group-list group-cards"]/ul/li')
          results = []
          for item in xml_results:
              try:
                  icon = item.xpath('.//img/@src')[0]
                  link = item.xpath('.//div[@class="title"]/a')[0]
                  url = link.get('href')
                  name = link.text
                  alias = url.rstrip('/').rsplit('/', 1)[1]
                  user_count = int(item.xpath('.//span[@class="num"]/text()')[0][1:-1])
                  results.append({
                      'icon': icon,
                      'alias': alias,
                      'url': url,
                      'name': name,
                      'user_count': user_count,
                  })
              except Exception as e:
                  self.api.logger.exception('parse joined groups exception: %s' % e)
          return build_list_result(results, xml)
docs: 已加入的小组列表
          
          :param user_alias: 用户名，默认为当前用户名
          :return: 单页列表