python scrapy 基本操作演示代码

# -*- coding: utf-8 -*-
import scrapy
# from quotetutorial.items import QuoteItem
from quotetutorial.items import QuotetutorialItem

# 主要编辑项目信息基本上都在在这里完成的

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

    # 爬取信息
    def parse(self, response):
        # pass
        # 打印源代码
        # print(response.text)
        quotes = response.css('.col-md-8 .quote')
        for quote in quotes:
            item = QuotetutorialItem()
            text = quote.css('.text::text').extract_first()
            author = quote.css('.author::text').extract_first() # 只提取一个内容 类似于 findone
            tags = quote.css('.tags .tag::text').extract() # 提多多个内容 类似于 findall
            item['text'] = text
            item['author'] = author
            item['tags'] = tags
            yield item
        next = response.css('.pager .netxt a::attr(href)').extract_first() # 选择下一页
        url = response.urljoin(next) # 因为获取的地址不完整，获取完整的网址加内容连接地址
        yield scrapy.Request(url=url,callback=self.parse()) # 从新调用自己并翻页
# 保存文件
# scrapy crawl quotes -o quotes.json
# scrapy crawl quotes -o quotes.jl
# scrapy crawl quotes -o quotes.csv
# scrapy crawl quotes -o quotes.xml
# scrapy crawl quotes -o ftp://user:pass@ftp.example.com/path/quotes.csv