code: def add(self, campaign_id, item_id, default_price, title, img_url, nick=None):
          '''xxxxx.xxxxx.adgroup.add
          ===================================
          创建一个推广组'''
          request = TOPRequest('xxxxx.xxxxx.adgroup.add')
          request['campaign_id'] = campaign_id
          request['item_id'] = item_id
          request['default_price'] = default_price
          request['title'] = title
          request['img_url'] = img_url
          if nick!=None: request['nick'] = nick
          self.create(self.execute(request), fields=['success','result','success','result_code','result_message'], models={'result':ADGroup})
          return self.resulf add(self, campaign_id, item_id, default_price, title, img_url, nick=None):
          '''xxxxx.xxxxx.adgroup.add
          ===================================
          创建一个推广组'''
          request = TOPRequest('xxxxx.xxxxx.adgroup.add')
          request['campaign_id'] = campaign_id
          request['item_id'] = item_id
          request['default_price'] = default_price
          request['title'] = title
          request['img_url'] = img_url
          if nick!=None: request['nick'] = nick
          self.create(self.execute(request), fields=['success','result','success','result_code','result_message'], models={'result':ADGroup})
          return self.result
docs: xxxxx.xxxxx.adgroup.add
          ===================================
          创建一个推广组