1.利用requests.get(url)获取网页页面的html文件
import requests
newsurl=‘http://news.gzcc.cn/html/xiaoyuanxinwen/‘
res = requests.get(newsurl) #返回response对象
res.encoding=‘utf-8‘
2.利用BeautifulSoup的HTML解析器，生成结构树
from bs4 import BeautifulSoup
soup = BeautifulSoup(res.text,‘html.parser‘)
3.找出特定标签的html元素
soup.p #标签名，返回第一个
soup.head
soup.p.name #字符串
soup.p. attrs #字典，标签的所有属性
soup.p. contents # 列表，所有子标签
soup.p.text #字符串
soup.p.string
soup.select(‘li‘)
4.取得含有特定CSS属性的元素
soup.select(‘#p1Node‘)
soup.select(‘.news-list-title‘)
import requests newsurl = ‘http://news.gzcc.cn/html/xiaoyuanxinwen/‘ res =requests.get(newsurl) res.encoding=‘utf-8‘ from bs4 import BeautifulSoup soup = BeautifulSoup(res.text,‘html.parser‘) soup.p soup.head soup.p.name soup.p.attrs soup.p.contents soup.p.text soup.p.string soup.select(‘li‘) soup.select(‘#p1Node‘) soup.select(‘.news-list-title‘)
5.练习：
取出h1标签的文本
取出a标签的链接
取出所有li标签的所有内容
取出一条新闻的标题、链接、发布时间、来源
print(soup.h1.text)
for link in soup.select(‘a‘):
print(link.get(‘href‘))
for i in soup.select(‘li‘):
print(i.contents[1])
print(soup.select(‘.news-list-title‘)[0].text)
print(soup.select(‘li‘)[0].a.attrs[‘href‘])
print(soup.select(‘.news-list-info‘)[0].contents[0].text)
print(soup.select(‘.news-list-info‘)[0].contents[1].text)
