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通過class獲取報錯

#!/usr/bin/python
#?-*-?coding:?UTF-8?-*-
#?文件名：test.py
from?bs4?import?BeautifulSoup
import?re
html_doc?=?"""
<html><head><title>The?Dormouse's?story</title></head>
<body>
<p?class="title"><b>The?Dormouse's?story</b></p>

<p?class="story">Once?upon?a?time?there?were?three?little?sisters;?and?their?names?were
<a?>Elsie</a>,
<a?>Lacie</a>?and
<a?>Tillie</a>;
and?they?lived?at?the?bottom?of?a?well.</p>

<p?class="story">...</p>
"""


soup?=?BeautifulSoup(html_doc,'html.parser',from_encoding='utf-8')

print?'獲取所有的鏈接'
links?=?soup.find_all('a')
for?link?in?links:
	print?link.name,link['href'],link.get_text()

print?'獲取lacie的鏈接'
link_node?=?soup.find('a',)
print?link_node.name,link_node['href'],link_node.get_text()

print?'獲取正則匹配'
link_node?=?soup.find('a',href=re.compile(r"lli"))
print?link_node.name,link_node['href'],link_node.get_text()

print?'獲取p段落'
p_node?=?soup.find('p',class_="title")
print?p_node.name,p_node.get_text()

報錯如下

獲取所有的鏈接

a http://example.com/elsie Elsie

a http://example.com/lacie Lacie

a http://example.com/tillie Tillie

獲取lacie的鏈接

a http://example.com/lacie Lacie

獲取正則匹配

a http://example.com/tillie Tillie

獲取p段落

Traceback (most recent call last):

? File "test.py", line 38, in <module>

? ? print p_node.name,p_node.get_text()

AttributeError: 'NoneType' object has no attribute 'name'


正在回答

7 回答

from?bs4?import?BeautifulSoup
from?nt?import?link
import?re
html_doc?=?"""
<html><head><title>The?Dormouse's?story</title></head>
<body>
<p?class="title"><b>The?Dormouse's?story</b></p>

<p?class="story">Once?upon?a?time?there?were?three?little?sisters;?and?their?names?were
<a?>Elsie</a>,
<a?>Lacie</a>?and
<a?>Tillie</a>;
and?they?lived?at?the?bottom?of?a?well.</p>

<p?class="story">...</p>
"""

#創(chuàng)建beautifusoup對象
soup?=?BeautifulSoup(html_doc,?'html.parser',from_encoding='utf-8')

print('獲取所有的鏈接')
links?=?soup.find_all('a')#查找所有標(biāo)簽為a的節(jié)點(diǎn)
for?link?in?links?:
????print?(link.name,link['href'],link.get_text())#(節(jié)點(diǎn)名稱，節(jié)點(diǎn)href屬性，鏈接字符)
????
print('單獨(dú)獲取Lacie的鏈接')
link_node?=?soup.find('a',)???
print?(link_node.name,link_node['href'],link_node.get_text())?


print('正則匹配')
link_node?=?soup.find('a',href=re.compile("ill"))???
print?(link_node.name,link_node['href'],link_node.get_text())?


print('獲取P段落文字')
p_node?=?soup.find('p',class_="title")???
print?(p_node.name,p_node.get_text())

代碼報錯：

C:\Python34\lib\site-packages\bs4\__init__.py:146: UserWarning: You provided Unicode markup but also provided a value for from_encoding. Your from_encoding will be ignored.

? warnings.warn("You provided Unicode markup but also provided a value for from_encoding. Your from_encoding will be ignored.")

獲取所有的鏈接

a http://example.com/elsie Elsie

a http://example.com/lacie Lacie

a http://example.com/tillie Tillie

單獨(dú)獲取Lacie的鏈接

Traceback (most recent call last):

? File "I:\workspace\HelloPython\src\hello\test_bs4.py", line 29, in <module>

? ? print (link_node.name,link_node['href'],link_node.get_text())?

AttributeError: 'NoneType' object has no attribute 'name'

代碼看了幾遍，感覺沒問題啊

0 回復(fù) 有任何疑惑可以回復(fù)我~
#1

mobrary

求大神解答?。。?！
2017-09-18 回復(fù) 有任何疑惑可以回復(fù)我~

#coding:utf-8
import re
from bs4 import BeautifulSoup
html_doc = """
<html><head><title>The Dormouse's story</title></head>
<body>
<p class="title"><b>The Dormouse's story</b></p>

<p class="story">Once upon a time there were three little sisters; and their names were
<a class="sister" id="link1">Elsie</a>,
<a class="sister" id="link2">Lacie</a> and
<a class="sister" id="link3">Tillie</a>;
and they lived at the bottom of a well.</p>

<p class="story">...</p>
"""

soup = BeautifulSoup(html_doc,'html.parser',from_encoding='utf-8')

print '獲取所有的鏈接'
links = soup.find_all('a') ?# ?查找含有 a 的標(biāo)簽
for link in links: ? ? ? ?
? ?print link.name,link['href'],link.get_text()

print '獲取lacie的鏈接'
link_node = soup.find('a',)
print link_node.name, link_node['href'], link_node.get_text()

print '正則表達(dá)式的匹配'
link_node = soup.find('a',href=re.compile(r'ti'))# ?正則表達(dá)式的強(qiáng)大 ,r' ' 中，''里面可以加任何字符
print link_node.name, link_node['href'], link_node.get_text()

print '獲取P段落文字'
p_node = soup.find('p',Class_= "story") ? ?# 這里的 class_ 加下劃線是為了與關(guān)鍵字 class 重復(fù)
print p_node.name, p_node.get_text()



我這沒有報錯，但是文字沒有打印出來?。?/p>

獲取所有的鏈接

a http://example.com/elsie Elsie

a http://example.com/lacie Lacie

a http://example.com/tillie Tillie

獲取lacie的鏈接

a http://example.com/lacie Lacie

正則表達(dá)式的匹配

a http://example.com/tillie Tillie

獲取P段落文字


Process finished with exit code 1


0 回復(fù) 有任何疑惑可以回復(fù)我~

出問題主要是下面的class要加一橫桿，如下所示則不會報錯，老師有講到

?title_node=soup.find('dd',class_="lemmaWgt-lemmaTitle-title").find("h1")

0 回復(fù) 有任何疑惑可以回復(fù)我~

為什么我的沒問題

0 回復(fù) 有任何疑惑可以回復(fù)我~ 
#?coding:utf8

from?bs4?import?BeautifulSoup
import?re

html_doc?=?"""
<html><head><title>The?Dormouse's?story</title></head>
<body>
<p?class="title"><b>The?Dormouse's?story</b></p>

<p?class="story">Once?upon?a?time?there?were?three?little?sisters;?and?their?names?were
<a?>Elsie</a>,
<a?>Lacie</a>?and
<a?>Tillie</a>;
and?they?lived?at?the?bottom?of?a?well.</p>

<p?class="story">...</p>
"""


soup?=?BeautifulSoup(html_doc,?'html.parser',?from_encoding="utf-8")

print?u'獲取所有鏈接'
links?=?soup.find_all('a')
for?link?in?links:
????print?link.name,link['href'],link.get_text()
????
print?'只獲取Lacie的鏈接'
link_node?=?soup.find('a',?)????
print?link_node.name,link_node['href'],link_node.get_text()


print?'正則匹配'
link_node?=?soup.find('a',?href=re.compile(r"ill"))????
print?link_node.name,link_node['href'],link_node.get_text()


0 回復(fù) 有任何疑惑可以回復(fù)我~

這是我試了無數(shù)遍得到的結(jié)論，雖然不知道是現(xiàn)在的版本不支持還是什么其他原因：

title_node?=?soup.find('dd',?attrs={'class':'lemmaWgt-lemmaTitle-title'}).find('h1')

我當(dāng)時這一句也是錯的，后來把 class_="???" 換成 attrs={'class':'???'} 就沒問題了

1 回復(fù) 有任何疑惑可以回復(fù)我~ 
#!/usr/bin/python
#?-*-?coding:?UTF-8?-*-
#?文件名：test.py
from?bs4?import?BeautifulSoup
import?re
html_doc?=?"""
<html><head><title>The?Dormouse's?story</title></head>
<body>
<p?class="title"><b>The?Dormouse's?story</b></p>

<p?class="story">Once?upon?a?time?there?were?three?little?sisters;?and?their?names?were
<a?>Elsie</a>,
<a?>Lacie</a>?and
<a?>Tillie</a>;
and?they?lived?at?the?bottom?of?a?well.</p>

<p?class="story">...</p>
"""

soup?=?BeautifulSoup(html_doc,'html.parser',from_encoding='utf-8')

print?'獲取所有的鏈接'
links?=?soup.find_all('a')
for?link?in?links:
	print?link.name,link['href'],link.get_text()

print?'獲取lacie的鏈接'
link_node?=?soup.find('a',)
print?link_node.name,link_node['href'],link_node.get_text()

print?'獲取正則匹配'
link_node?=?soup.find('a',href=re.compile(r"lli"))
print?link_node.name,link_node['href'],link_node.get_text()

print?'獲取p段落'
p_node?=?soup.find("p",?"title")
print?p_node.name,p_node.get_text()

看文檔解決，不要那個class_

3 回復(fù) 有任何疑惑可以回復(fù)我~

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