Passing a argument to a callback function [duplicate]

This is what you’d use the meta Keyword for.

def parse(self, response):
    for sel in response.xpath('//tbody/tr'):
        item = HeroItem()
        # Item assignment here
        url="https://" + item['server'] + '.battle.net/' + sel.xpath('td[@class="cell-BattleTag"]//a/@href').extract()[0].strip()

        yield Request(url, callback=self.parse_profile, meta={'hero_item': item})

def parse_profile(self, response):
    item = response.meta.get('hero_item')
    item['weapon'] = response.xpath('//li[@class="slot-mainHand"]/a[@class="slot-link"]/@href').extract()[0].split("https://stackoverflow.com/")[4]
    yield item

Also note, doing sel = Selector(response) is a waste of resources and differs from what you did earlier, so I changed it. It’s automatically mapped in the response as response.selector, which also has the convenience shortcut of response.xpath.