Python-从模块导入类的实例

我用以下方法创建了此类parse()：

class PitchforkSpider(scrapy.Spider):
    name = "pitchfork_reissues"
    allowed_domains = ["pitchfork.com"]
    #creates objects for each URL listed here
    start_urls = [
                    "http://pitchfork.com/reviews/best/reissues/?page=1",
                    "http://pitchfork.com/reviews/best/reissues/?page=2",
                    "http://pitchfork.com/reviews/best/reissues/?page=3",
    ]

    def parse(self, response):

        for sel in response.xpath('//div[@class="album-artist"]'):
            item = PitchforkItem()
            item['artist'] = sel.xpath('//ul[@class="artist-list"]/li/text()').extract()
            item['reissue'] = sel.xpath('//h2[@class="title"]/text()').extract()

        return item

然后我导入属于的module地方class：

from blogs.spiders.pitchfork_reissues_feed import *

并尝试parse()在其他情况下致电：

def reissues(self):

    pitchfork_reissues = PitchforkSpider()
    reissues = pitchfork_reissues.parse('response')
    print (reissues)

但出现以下错误：

pitchfork_reissues.parse('response')
  File "/Users/vitorpatalano/Documents/Code/Soup/Apps/myapp/blogs/blogs/spiders/pitchfork_reissues_feed.py", line 21, in parse
    for sel in response.xpath('//div[@class="album-artist"]'):
AttributeError: 'str' object has no attribute 'xpath'

我想念什么？