Scrapy Spider無法保存到CSV

Question

我有一個蜘蛛，它從文本文件中讀取網址列表，並從每個文件中保存標題和正文。 抓取有效，但數據未保存到csv。 我設置了一個保存到csv的管道，因為普通的-o選項對我不起作用。 我確實更改了piepline的settings.py。 任何幫助，將不勝感激。 代碼如下：

Items.py

from scrapy.item import Item, Field

class PrivacyItem(Item):
    # define the fields for your item here like:
    # name = Field()
    title = Field()
    desc = Field()

PrivacySpider.py

    from scrapy.contrib.spiders import CrawlSpider, Rule
    from scrapy.selector import HtmlXPathSelector
    from privacy.items import PrivacyItem

class PrivacySpider(CrawlSpider):
    name = "privacy"
    f = open("urls.txt")
    start_urls = [url.strip() for url in f.readlines()]
    f.close()

def parse(self, response):
    hxs = HtmlXPathSelector(response)
    items =[]
    for url in start_urls:
        item = PrivacyItem()
        item['desc'] = hxs.select('//body//p/text()').extract()
        item['title'] = hxs.select('//title/text()').extract()      
        items.append(item)

    return items

Pipelines.py

import csv

class CSVWriterPipeline(object):

    def __init__(self):
        self.csvwriter = csv.writer(open('CONTENT.csv', 'wb'))

    def process_item(self, item, spider):
        self.csvwriter.writerow([item['title'][0], item['desc'][0]])
        return item

Answer 1

您不必在start_urls上循環，scrapy正在執行以下操作：

for url in spider.start_urls:
    request url and call spider.parse() with its response

因此您的解析函數應類似於：

def parse(self, response):
    hxs = HtmlXPathSelector(response)
    item = PrivacyItem()
    item['desc'] = hxs.select('//body//p/text()').extract()
    item['title'] = hxs.select('//title/text()').extract()      
    return item

還應嘗試避免將列表作為項目字段返回，請執行以下操作： hxs.select('..').extract()[0]