print('Hello, 2019年一定要当上程序员！')
import requests
from bs4 import BeautifulSoup
import time
import os
'''
爬取心得：
如果页面看到的数据没有爬取的了，就去XHR里面看看，有时候你看到的页面数据的URl和网页上面的URL不一致，就像这篇代码一样
目标url：https://news.baidu.com/internet
做了修改之后，完美呐，不会覆盖原有的本地新闻，每次打开都会自动添加新的新闻保存到本地，自动跳过旧的新闻
'''
def urls(url, headers): #爬取所有url
urlsss = []
r = requests.get(url, headers=headers).text
soup = BeautifulSoup(r,'lxml')
for i in soup.find_all('h3'): #[:-3]
urlsss.append(i.a.get('href'))
return urlsss
def url_neirong(urls,headers): #每章内容的操作
#先检查是否存在该文件夹
if os.path.exists('D:/IT/新闻/'):
pass
else:
os.mkdir('D:/IT/新闻/')
for q in urls:
try:
time.sleep(2)
r = requests.get(q, headers=headers).text
soup = BeautifulSoup(r,'lxml')
for i in soup.find('div', class_="article-title"): #每章的标题
if os.path.exists('D:/IT/新闻/' + i.get_text() +'.txt'): #检查是否已存在该文件
print('已存在：',i.get_text())
continue
else:
for i in soup.find('div', class_="article-title"): #每章的标题
print('标题：'+ i.get_text())
f = open('D:/IT/新闻/'+ i.get_text() +'.txt','w',encoding='utf-8')
f.write('标题：'+ i.get_text() + '\n')
for i in soup.find_all('div', class_="article-source article-source-bjh"): #发布日期
print('-'*30)
print('日期：'+ i.find(class_="date").get_text(), end=' ');print('时间：'+ i.find(class_="time").get_text(), end=' ');print('URL:',q)
aas = '日期：'+ i.find(class_="date").get_text()
aad = '时间：'+ i.find(class_="time").get_text()
aaf = 'URL:%s'%q
f.write(aas + '\t')
f.write(aad + '\t')
f.write(aaf + '\n')
print('-'*30)
for i in soup.find_all('div', class_="article-content"): #每章的内容
f.write(i.get_text())
f.close()
print('*'*100)
except Exception as result:
print('网页不存在了。。。')
print('%s',result)
print('*'*100)
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36'}
url = 'https://news.baidu.com/widget?id=AllOtherData&channel=internet&t=1554738238830'
print(url_neirong(urls(url,headers), headers))
print('完成！！！')
运行结果：
