Scrapy 返回多个项目 [英] Scrapy Return Multiple Items

问题描述

我是新来的Scrapy，我真的只是失去了我如何能在一个块中返回多个项目.

I'm new to Scrapy and I'm really just lost on how i can return multiple items in one block.

基本上，我得到了一个 HTML 标签，它有一个引用，其中包含嵌套的文本标签、作者姓名和一些关于该引用的标签.

Basically, I'm getting one HTML tag which has a quote that contains nested tags of text, author name, and some tags about that quote.

此处的代码仅返回一个引号，仅此而已.它不使用循环返回其余部分.我已经在网上搜索了几个小时，但我很绝望我没有得到它.到目前为止，这是我的代码:

The code here only returns one quote and that's it. It doesnt use the loop to return the rest. I've been searching the web for hours and I'm just hopeless I don't get it. Here's my code so far:

Spider.py

import scrapy
from scrapy.loader import ItemLoader
from first_spider.items import FirstSpiderItem

class QuotesSpider(scrapy.Spider):
name = 'quotes'
allowed_domains = ['quotes.toscrape.com']
start_urls = ['http://quotes.toscrape.com/']

def parse(self, response):
    l = ItemLoader(item = FirstSpiderItem(), response=response)

    quotes = response.xpath("//*[@class='quote']")

    for quote in quotes:
        text = quote.xpath(".//span[@class='text']/text()").extract_first()
        author = quote.xpath(".//small[@class='author']/text()").extract_first()
        tags = quote.xpath(".//meta[@class='keywords']/@content").extract_first()

        # removes quotation marks from the text
        for c in ['"', '"']:
            if c in text:
                text = text.replace(c, "")

        l.add_value('text', text)
        l.add_value('author', author)
        l.add_value('tags', tags)
        return l.load_item()

    next_page_path = 
    response.xpath(".//li[@class='next']/a/@href").extract_first()

    next_page_url = response.urljoin(next_page_path)
    yield scrapy.Request(next_page_url)

Items.py

import scrapy

class FirstSpiderItem(scrapy.Item):

text = scrapy.Field()
author = scrapy.Field()
tags = scrapy.Field()

这是我要抓取的页面:

链接

推荐答案

我也在寻找相同问题的解决方案.这是我找到的解决方案:

I was also searching for a solution for the same problem. And here is the solution that I have found:

def parse(self, response):
    for selector in response.xpath("//*[@class='quote']"):
        l = ItemLoader(item=FirstSpiderItem(), selector=selector)
        l.add_xpath('text', './/span[@class="text"]/text()')
        l.add_xpath('author', '//small[@class="author"]/text()')
        l.add_xpath('tags', './/meta[@class="keywords"]/@content')
        yield l.load_item()

    next_page = response.xpath(".//li[@class='next']/a/@href").extract_first()
    if next_page is not None:
        yield response.follow(next_page, callback=self.parse)

要从文本中删除引号，您可以使用 items.py 中的输出处理器.

To remove quotation marks from the text, you can use an output processor in items.py.

from scrapy.loader.processors import MapCompose

def replace_quotes(text):
    for c in ['"', '"']:
        if c in text:
            text = text.replace(c, "")
    return text

class FirstSpiderItem(scrapy.Item):
    text = scrapy.Field()
    author = scrapy.Field()
    tags = scrapy.Field(output_processor=MapCompose(replace_quotes))

请告诉我它是否有帮助.

Please let me know whether it was helpful.

这篇关于Scrapy 返回多个项目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！