在输出到CSV之前，如何剥离废除结果

Question

我试图将整数与某些HTML隔离，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 

我的代码成功地删除了逗号和"英里"，但是在我的CSV输出中，我在此列中获得了不必要的空白行，我认为这是由于原始源中的托架返回所致。我的CSV看起来像这样：

我的CSV

因此标题和价格列很好。但是里程列是错误的位置。

我的条命令有问题吗？

Answer 1

只需更改里程的xpath

来自

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

to

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

您将获得正确输出的输出：

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