python爬虫正则表达式问题,python爬虫,scrapy爬虫,里面用


scrapy爬虫,里面用到一个正则表达式,有如下错误信息,麻烦看一下是怎么的?
爬虫代码:

def parseContent(self, response):    for sel in response.xpath('//div[@class="lefcon"]'):        item = NovelspiderItem()        content=sel.xpath('div[3]/div/p/text()').extract()        item['content'] = re.search("正文:(.*?)</p",content,re.S).group(1)        yield item

错误信息:

  File "D:\novelspider\novelspider\spiders\novspider.py", line 62, in parseContent    item['content'] = re.search("正文:(.*?)</p",content,re.S).group(1)  File "C:\Python27\lib\re.py", line 146, in search    return _compile(pattern, flags).search(string)TypeError: expected string or buffer

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