python爬虫笔记（四）网络爬虫之提取—Beautiful Soup库（1）

1. Beautiful Soup安装

pip install beautifulsoup

linux要用 pip3 

2. 使用

使用这个网站：https://python123.io/ws/demo.html

# -*- coding: utf-8 -*-
"""
Created on Tue Jan 21 21:29:56 2020

@author: douzi
"""

import requests
from bs4 import BeautifulSoup

r = requests.get("http://python123.io/ws/demo.html")
print(r.text)

demo = r.text

soup = BeautifulSoup(demo, "html.parser")
print(soup.prettify())

3. Beautiful Soup库的理解

4. 获取html的Tag标签

4.1 title标签

import requests
from bs4 import BeautifulSoup

r = requests.get("http://python123.io/ws/demo.html")
print(r.text, "
")

demo = r.text

soup = BeautifulSoup(demo, "html.parser")
print(soup.title)

4.2 a标签（链接标签）

tag = soup.a
print(tag)

4.3 获取标签属性

4.4 标签之间的字符串（NavigableString）

4.5 注释

5. 小结