Python Scrapy：没有模块命名项，正在抓取图像

我正在尝试一个使用scrapy从web页面下载图像的示例

这是spider文件：

from scrapy import Spider, Item, Field, Request
from items import TrousersItem
class TrouserScraper(Spider):
    name, start_urls = "Trousers_spider", ["http://lookatmyfuckingredtrousers.blogspot.co.uk"]
    def parse(self, response):
        for image in response.selector.xpath('//*[contains(@class, "entry-content")]/div[contains(@class, "separator")]/a/img/@src'):
             yield TrousersItem(image_urls=[image.extract()])
        for url in response.selector.xpath("//*[contains(@class, 'blog-pager-older-link')]/@href"):
            yield Request(url.extract(), callback=self.parse)

以及items.py：

import scrapy
from scrapy.item import Item


class TrousersItem(scrapy.Item):
    image_urls = scrapy.Field()
    images = scrapy.Field()

我打字的时候

scrapy crawl Trousers_spider

我得到这个错误：

没有模块命名项

您需要：

假设

from yourproject.items import TrousersItem