如何在输出到 CSV 之前剥离 Scrapy 结果

Question

我正在尝试将整数与某些 HTML 隔离开来，例如"
5,500 英里
”。

import scrapy

class AlfaShortSpider(scrapy.Spider):
    name = 'alfashort'

    def start_requests(self):
        yield scrapy.Request(url = 'https://www.pistonheads.com/classifieds/used-cars/alfa-romeo/giulia',
                             callback = self.parse_data)


    def parse_data( self, response ):
        advert = response.xpath( '//*[@class="ad-listing"]')
        title = advert.xpath( './/*[@class="listing-headline"]//h3/text()' ).extract()
        price = advert.xpath( './/*[@class="price"]/text()' ).extract()
        mileage = advert.xpath( './/*[@class="specs"]//li[1]/text()' ).extract()
        mileage = [item.strip() for item in mileage]
        mileage = [item.replace(',','') for item in mileage]
        mileage = [item.replace(' miles','') for item in mileage]

        for item in zip(title,price,mileage):
            price_data = {
                    'title' : item[0],
                    'price' : item[1],
                    'mileage' : item[2]
            }

            yield price_data 

我的代码成功删除了逗号和“英里”，但在我的 CSV 输出中，我在此列中得到了不需要的空白行，我认为这是由于原始源中的回车所致。我的 CSV 如下所示：

my CSV

所以标题和价格列没问题。但是 Mileage 列是错误所在。

我的 Strip 命令有问题吗？

Answer 1

只需更改里程的 XPath

来自

mileage = advert.xpath( './/*[@class="specs"]//li[1]/text()' ).extract()

到

mileage = advert.xpath( './/*[@class="specs"]//li[1]/text()[2]' ).extract()

你会得到正确的输出：

title,price,mileage
ALFA ROMEO GIULIA (0) V6 BITURBO QUADRIFOGLIO                  2018 (2018),"£48,500",5500
ULEZ CHARGE EXEMPT! EURO 6  (2017),"£25,695",11450
ALFA ROMEO GIULIA (0) V6 BITURBO QUADRIFOGLIO NRING            2019 (2019),"£83,500",100
ALFA ROMEO GIULIA (0) TD SPECIALE                              2017 (2017),"£22,500",23700