code: def update(self, adgroup_id, creative_id, title, img_url, nick=None):
          '''xxxxx.xxxxx.creative.update
          ===================================
          更新一个创意的信息，可以设置创意标题、创意图片'''
          request = TOPRequest('xxxxx.xxxxx.creative.update')
          request['adgroup_id'] = adgroup_id
          request['creative_id'] = creative_id
          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':CreativeRecord})
          return self.resulf update(self, adgroup_id, creative_id, title, img_url, nick=None):
          '''xxxxx.xxxxx.creative.update
          ===================================
          更新一个创意的信息，可以设置创意标题、创意图片'''
          request = TOPRequest('xxxxx.xxxxx.creative.update')
          request['adgroup_id'] = adgroup_id
          request['creative_id'] = creative_id
          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':CreativeRecord})
          return self.result
docs: xxxxx.xxxxx.creative.update
          ===================================
          更新一个创意的信息，可以设置创意标题、创意图片