Python爬虫练手，一个简单的Python资讯采集案例

一个简单的Python资讯采集案例，列表页到详情页，到数据保存，保存为txt文档，网站网页结构算是比较规整，简单清晰明了，资讯新闻内容的采集和保存！

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应用到的库

requests，time，re，UserAgent，etree

 import requests,time,re
from fake_useragent import UserAgent
from lxml import etree 

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列表页面

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列表页，链接xpath解析

 href_list=req.xpath('//ul[@class="news-list"]/li/a/@href') 

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详情页

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内容xpath解析

 h2=req.xpath('//div[@class="title-box"]/h2/text()')[0]
author=req.xpath('//div[@class="title-box"]/span[@class="news-from"]/text()')[0]
details=req.xpath('//div[@class="content-l detail"]/p/text()') 

内容格式化处理

 detail='\n'.join(details) 

标题格式化处理，替换非法字符

 pattern = r"[\/\\\:\*\?\"\<\>\|]"
new_title = re.sub(pattern, "_", title)  # 替换为下划线 

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保存数据，保存为txt文本

 def save(self,h2, author, detail):
    with open(f'{h2}.txt','w',encoding='utf-8') as f:
        f.write('%s%s%s%s%s'%(h2,'\n',detail,'\n',author))


    print(f"保存{h2}.txt文本成功！") 

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遍历数据采集，yield处理

 def get_tasks(self):
    data_list = self.parse_home_list(self.url)
    for item in data_list:
        yield item 

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程序运行效果

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程序采集效果

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附源码参考：

 #研招网考研资讯采集
#20200710 by微信：huguo00289
# -*- coding: UTF-8 -*-


import requests,time,re
from fake_useragent import UserAgent
from lxml import etree


class RandomHeaders(object):
    ua=UserAgent()
    @property
    def random_headers(self):
        return {
            'User-Agent': self.ua.random,
        }


class Spider(RandomHeaders):
    def __init__(self,url):
        self.url=url




    def parse_home_list(self,url):
        response=requests.get(url,headers=self.random_headers).content.decode('utf-8')
        req=etree.HTML(response)
        href_list=req.xpath('//ul[@class="news-list"]/li/a/@href')
        print(href_list)
        for href in href_list:
            item = self.parse_detail(f'https://yz.chsi测试数据.cn{href}')
            yield item




    def parse_detail(self,url):
        print(f">>正在爬取{url}")
        try:
            response = requests.get(url, headers=self.random_headers).content.decode('utf-8')
            time.sleep(2)
        except Exception as e:
            print(e.args)
            self.parse_detail(url)
        else:
            req = etree.HTML(response)
            try:
                h2=req.xpath('//div[@class="title-box"]/h2/text()')[0]
                h2=self.validate_title(h2)
                author=req.xpath('//div[@class="title-box"]/span[@class="news-from"]/text()')[0]
                details=req.xpath('//div[@class="content-l detail"]/p/text()')
                detail='\n'.join(details)
                print(h2, author, detail)
                self.save(h2, author, detail)
                return h2, author, detail
            except IndexError:
                print(">>>采集出错需延时，5s后重试..")
                time.sleep(5)
                self.parse_detail(url)




    @staticmethod
    def validate_title(title):
        pattern = r"[\/\\\:\*\?\"\<\>\|]"
        new_title = re.sub(pattern, "_", title)  # 替换为下划线
        return new_title






    def save(self,h2, author, detail):
        with open(f'{h2}.txt','w',encoding='utf-8') as f:
            f.write('%s%s%s%s%s'%(h2,'\n',detail,'\n',author))


        print(f"保存{h2}.txt文本成功！")




    def get_tasks(self):
        data_list = self.parse_home_list(self.url)
        for item in data_list:
            yield item








if __name__=="__main__":
    url="https://yz.chsi测试数据.cn/kyzx/jyxd/"
    spider=Spider(url)
    for data in spider.get_tasks():
????????print(data)
????????
 

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免责声明：代码仅学习使用，勿用于非法用途

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