python爬虫新闻列表_Python爬虫实战案例：爬取新闻资讯
本文的文字及图片来源于网络,仅供学习、交流使用,不具有任何商业用途,
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！
应用到的库
requests，time，re，UserAgent，etree
import requests,time,re
from fake_useragent import UserAgent
from lxml import etree
列表页面
列表页，链接xpath解析
href_list=req.xpath('//ul[@class="news-list"]/li/a/@href')
详情页
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
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！")
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
程序运行效果
程序采集效果
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.com.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.com.cn/kyzx/jyxd/"
spider=Spider(url)
for data in spider.get_tasks():
print(data) 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)) prier(url) for data in spider.get_tasks(): print(data)
专门建立的Python学习扣扣圈，从零基础开始到Python各领域的项目实战教程、开发工具与电子书籍。与你分享企业当下对于python人才需求及学好python的高效技巧，不停更新最新教程！点击加入我们的python学习圈