bs4 find

1. find() 找 h1 標籤。

   [dywang@dywmac zzz]$ cat crawler7.py 
   #!/usr/bin/env python
   # coding: utf-8
   import bs4
   
   htmlfile = open('node2.html')
   soup = bs4.BeautifulSoup(htmlfile, 'lxml')
   tag = soup.find('h1')
   print("tyep: ", type(tag))
   print("tag: ", tag)
   print("tag text: %s" % tag.text)
   

2. 執行程式，找到標籤 h1，內容為「認識 Python」。

   [dywang@dywmac zzz]$ ./crawler7.py 
   ('tyep: ', <class 'bs4.element.Tag'>)
   ('tag: ', <h1><a name="SECTION00200000000000000000">
   認識 Python</a>
   </h1>)
   tag text: 
   認識 Python
   

3. find_all() 找所有標籤 li，並列印內容。

   [dywang@dywmac zzz]$ cat crawler8.py 
   #!/usr/bin/env python
   # coding: utf-8
   import bs4
   
   htmlfile = open('node2.html')
   soup = bs4.BeautifulSoup(htmlfile, 'lxml')
   tag = soup.find_all('li')
   print("tyep: ", type(tag))
   print("tag: ", tag)
   print("tag text: ")
   for data in tag:
   	print(data.text)
   

4. 執行程式，找到所有標籤 li。

   [dywang@dywmac zzz]$ ./crawler8.py 
   ('tyep: ', <type 'list'>)
   ('tag: ', [<li><a href="node3.html" name="tex2html184">簡介</a>
   </li>, <li><a href="node4.html" name="tex2html185">安裝與執行</a>
   </li>, <li><a href="node5.html" name="tex2html186">內縮語法</a>
   </li>, <li><a href="node6.html" name="tex2html187">括號、引號、換行、註解</a>
   </li>])
   tag text: 
   簡介
   
   安裝與執行
   
   內縮語法
   
   括號、引號、換行、註解