23-python用BeautifulSoup用抓取a标签内所有数据 37-python中bs4获取的标签中如何提取子标签？
1.获取子标签：
thr_msgs=soup.find_all('div',class_=re.compile('msg'))
foriinthr_msgs:
print(i)
first=i.select('em:nth-of-type(1)')
print(first)
>>>
<divclass='\"msg\"'><em>佛山</em><em>1-3年</em><em>大专</em></div>
[<em>佛山</em>]
<divclass='\"msg\"'><em>南京</em><em>3-5年</em><em>本科</em></div>
[<em>南京</em>]
<divclass='\"msg\"'><em>南阳</em><em>1-3年</em><em>大专</em></div>
[<em>南阳</em>]
<divclass='\"msg\"'><em>深圳</em><em>1年以内</em><em>本科</em></div>
[<em>深圳</em>]
2.过去一个标签内内容：
原文：https://blog.csdn.net/suibianshen2012/article/details/62040460?utm_source=copy
# -*- coding:utf-8 -*-
#python 2.7
#XiaoDeng
#http://tieba.baidu.com/p/2460150866
#标签操作
from bs4 import BeautifulSoup
import urllib.request
import re
#如果是网址，可以用这个办法来读取网页
#html_doc = "http://tieba.baidu.com/p/2460150866"
#req = urllib.request.Request(html_doc)
#webpage = urllib.request.urlopen(req)
#html = webpage.read()
html="""
<html><head><title>The Dormouse's story</title></head>
<body>
<p class="title" name="dromouse"><b>The Dormouse's story</b></p>
<p class="story">Once upon a time there were three little sisters; and their names were
<a href="http://example.com/elsie" class="sister" ><!-- Elsie --></a>,
<a href="http://example.com/lacie" class="sister" >Lacie</a> and
<a href="http://example.com/tillie" class="sister" >Tillie</a>;
<a href="http://example.com/lacie" class="sister" >Lacie</a>
and they lived at the bottom of a well.</p>
<p class="story">...</p>
"""
soup = BeautifulSoup(html, 'html.parser') #文档对象
#查找a标签,只会查找出一个a标签
#print(soup.a)#<a class="sister" href="http://example.com/elsie" ><!-- Elsie --></a>
for k in soup.find_all('a'):
print(k)
print(k['class'])#查a标签的class属性
print(k['id'])#查a标签的id值
print(k['href'])#查a标签的href值
print(k.string)#查a标签的string
#tag.get('calss')，也可以达到这个效果