Question

我正在努力学习Scrapy。

    # -*- coding: utf-8 -*-
import scrapy


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

    def parse(self, response):
        quotes = response.xpath('//*[@class="quote"]')

        for quote in quotes:
            text = quote.xpath(".//*[@class='text']/text()").extract_first()
            author = quote.xpath("//*[@itemprop='author']/text()").extract_first()
            tags = quote.xpath(".//*[@class='tag']/text()").extract();

            item = {
                'author_name':author,
                'text':text,
                'tags':tags
            }
            yield item
    next_page_url = response.xpath("//*[@class='next']/a/@href").extract_first()
    absolute_next_page_url = response.urljoin(next_page_url)
    yield scrapy.Request(url=absolute_next_page_url,callback=self.parse)

但scrapy只解析第一页。这段代码有什么问题。我从youtube教程中复制了它。

请帮忙。

Answer 1

只是除了第一个请求之外的所有请求都被过滤为“非现场”。这是因为您在/值的末尾有额外的allowed_domains：

allowed_domains = ['quotes.toscrape.com/']
                    # REMOVE THIS SLASH^

Answer 2

删除或注释掉allowed_domains。（可选）删除分号＃15。此外，将以下代码缩进parse方法中：

next_page_url = response.xpath("//*[@class='next']/a/@href").extract_first()
absolute_next_page_url = response.urljoin(next_page_url)
yield scrapy.Request(url=absolute_next_page_url,callback=self.parse)

因此它将变成以下代码：

import scrapy


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

    def parse(self, response):
        quotes = response.xpath('//*[@class="quote"]')

        for quote in quotes:
            text = quote.xpath(".//*[@class='text']/text()").extract_first()
            author = quote.xpath("//*[@itemprop='author']/text()").extract_first()
            tags = quote.xpath(".//*[@class='tag']/text()").extract()

            item = {
                'author_name':author,
                'text':text,
                'tags':tags
            }
            yield item

        next_page_url = response.xpath("//*[@class='next']/a/@href").extract_first()
        absolute_next_page_url = response.urljoin(next_page_url)
        yield scrapy.Request(url=absolute_next_page_url,callback=self.parse)

Scrapy分页不起作用

2 个答案: