scrapy xpath选择器重复数据

Question

我试图从每个列表中提取业务名称和地址并将其导出到-csv,但我遇到输出csv的问题.我认为bizs = hxs.select("// div [@ class ='listing_content']")可能会导致问题.

yp_spider.py

from scrapy.spider import BaseSpider
from scrapy.selector import HtmlXPathSelector
from yp.items import Biz

class MySpider(BaseSpider):
    name = "ypages"
    allowed_domains = ["yellowpages.com"]
    start_urls = ["http://www.yellowpages.com/sanfrancisco/restaraunts"]

    def parse(self, response):
        hxs = HtmlXPathSelector(response)
        bizs = hxs.select("//div[@class='listing_content']")
        items = []

        for biz in bizs:
            item = Biz()
            item['name'] = biz.select("//h3/a/text()").extract()
            item['address'] = biz.select("//span[@class='street-address']/text()").extract()
            print item
            items.append(item)

items.py

# Define here the models for your scraped items
#
# See documentation in:
# http://doc.scrapy.org/topics/items.html

from scrapy.item import Item, Field

class Biz(Item):
    name = Field()
    address = Field()

    def __str__(self):
        return "Website: name=%s address=%s" %  (self.get('name'), self.get('address'))

'scrapy crawl ypages -o list.csv -t csv'的输出是一个很长的商业名称列表,然后是位置,它会多次重复相同的数据.

Answer 1

你应该添加一个"." 选择相对xpath,这里是来自scrapy文档(http://doc.scrapy.org/en/0.16/topics/selectors.html)

首先,您可能会尝试使用以下方法,这是错误的,因为它实际上提取了所有方法

文档中的元素,而不仅仅是元素内部的元素:

>>> for p in divs.select('//p') # this is wrong - gets all <p> from the whole document
>>>     print p.extract()

这是正确的方法(请注意.//p XPath前缀的点):

>>> for p in divs.select('.//p') # extracts all <p> inside
>>>     print p.extract()