【Rollo的Python之路】Python 爬虫系统学习 (十) Scrapy 练习

Scrapy 练习 :

spiders:

import scrapy
from yg.items import YgItem
from copy import deepcopy

class YangguangSpider(scrapy.Spider):
    name = 'yangguang'
    allowed_domains = ['sun0769.com']
    start_urls = ['http://wz.sun0769.com/index.php/question/huiyin']

    def parse(self, response):
        #分组
        tr_list = response.xpath("//div[@class='newsHead clearfix']/table[2]/tr")
        for tr in tr_list:
            item = YgItem()
            item["title"] = tr.xpath("./td[3]/a/text()").extract_first()
            item["href"] = tr.xpath("./td[3]/a/@href").extract_first()
            item["publish_date"] = tr.xpath("./td[6]/text()").extract_first()
            print(item)
            yield scrapy.Request(
                item["href"],
                callback=self.parse_details,
                meta = {"item":deepcopy(item)}
            )
        next_url = response.xpath("//a[text()='>']/@href").extract_first()
        if next_url is not None:
            yield scrapy.Request(
                next_url,
                callback=self.parse,
                meta={"item":item}
            )


    def parse_details(self,response):
        item = response.meta["item"]
        item["content"] = response.xpath("//td[@class='txt16_3']//text()").extract()
        item["img"] = response.xpath("//td[@class='txt16_3']//img/@src").extract()
        item["img"] = ["http://wz.sun0769.com" + i for i in item["img"]]
        print(item)

items.py:

import scrapy


class YgItem(scrapy.Item):
    # define the fields for your item here like:
    # name = scrapy.Field()
    title = scrapy.Field()
    href = scrapy.Field()
    publish_date = scrapy.Field()
    img = scrapy.Field()
    content = scrapy.Field()

settings.py

BOT_NAME = 'yg'

SPIDER_MODULES = ['yg.spiders']
NEWSPIDER_MODULE = 'yg.spiders'

LOG_LEVEL = 'WARNING'


# Crawl responsibly by identifying yourself (and your website) on the user-agent
USER_AGENT = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36'

# Obey robots.txt rules
ROBOTSTXT_OBEY = False