[英]Scrapy spider not saving to csv
我有一个蜘蛛,它从文本文件中读取网址列表,并从每个文件中保存标题和正文。 抓取有效,但数据未保存到csv。 我设置了一个保存到csv的管道,因为普通的-o选项对我不起作用。 我确实更改了piepline的settings.py。 任何帮助,将不胜感激。 代码如下:
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
您不必在start_urls
上循环,scrapy正在执行以下操作:
for url in spider.start_urls:
request url and call spider.parse() with its response
因此您的解析函数应类似于:
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
还应尝试避免将列表作为项目字段返回,请执行以下操作: hxs.select('..').extract()[0]
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