scrapy的學習之路1(簡單的例子)

scrapy的安裝

環境:python3.6

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pip install -i https://pypi.douban.com/simple/  scrapy

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scrapy startproject ArticleSpider

main.py是後面建立用來運行scrapy的

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cd ArticleSpider

scrapy genspider jobbole blog.jobbole.com
                 ------- ----------------
                 spider名    網站域名

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在ArticleSpider建立main.py,能夠經過此文件運行scrapy

from scrapy.cmdline import execute
import sys
import os


# print(__file__) #本文件名
# print(os.path.dirname(__file__)) #父文件名
# print(os.path.abspath(os.path.dirname(__file__))) #路徑和父文件名

sys.path.append(os.path.dirname(os.path.abspath(__file__))) #設置環境，必須

execute(["scrapy", "crawl", "jobbole"])

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5

以上運行可能在win下會報錯

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6

settings.py

準備工做完

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在jobbole.py下

# -*- coding: utf-8 -*-
import scrapy
from scrapy.http import Request
import re
from urllib import parse


class JobboleSpider(scrapy.Spider):
    name = 'jobbole'
    allowed_domains = ['blog.jobbole.com']
    start_urls = ['http://blog.jobbole.com/all-posts/']
    
    def parse(self, response):
        # 獲取列表頁每個item的url
        post_urls = response.css('#archive .floated-thumb .post-thumb a::attr(href)').extract()
        for post_url in post_urls:
            print(post_url)
            yield Request(url=parse.urljoin(response.url, post_url), callback=self.parse_info)  # 把獲取到的url交給詳情頁的方法處理
        # 獲取下一頁的url
        next_url = response.css('.next.page-numbers::attr(href)').extract_first()
        if next_url:
            yield Request(url=parse.urljoin(response.url, next_url), callback=self.parse)  # 把獲取到的下一頁的url交給本身的方法處理
    
    """獲取詳情頁的信息"""
    def parse_info(self, response):
        # 如下都是獲取詳情頁信息
        res_title = response.xpath('//div[@class="entry-header"]/h1/text()').extract_first()
        res_date = response.xpath('//p[@class="entry-meta-hide-on-mobile"]/text()').extract_first().strip().replace('·', '').strip()
        res_zhan = response.xpath('//span[contains(@class, "vote-post-up")]/h10/text()').extract_first()
        res_content = response.xpath('//div[@class="entry"]/p/text()').extract_first()

        res_cate_a = response.xpath('//p[@class="entry-meta-hide-on-mobile"]/a/text()').extract_first()
        res_cate_b = [i.strip() for i in res_cate_a if not i.strip().endswith('評論')]
        res_cate_c = ','.join(res_cate_b)

        res_shoucang = response.xpath('//div[@class="post-adds"]/span[2]/text()').extract_first().strip()
        match_obj1 = re.match('.*(\d+).*', res_shoucang)
        if match_obj1:
            res_shoucang = match_obj1.group(1)
        else:
            res_shoucang = 0

        res_comment = response.xpath('//div[@class="post-adds"]/a/span/text()').extract_first().strip()
        match_obj2 = re.match('.*(\d+).*', res_comment)
        if match_obj2:
            res_comment = match_obj2.group(1)
        else:
            res_comment = 0