为什么仅使用两个类似命令之一会出现错误“NoneType”对象没有属性“内容”？

我正在从中提取内容url https://www.collinsdictionary.com/dictionary/french-english/aimer.

import requests
from bs4 import BeautifulSoup

url = 'https://www.collinsdictionary.com/dictionary/french-english/aimer'
headers = {'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0'}
soup = BeautifulSoup(requests.get(url, headers = headers).content, 'html.parser')

for script in soup.select('script, .hcdcrt, #ad_contentslot_1, #ad_contentslot_2'):
    script.extract()

entry_name = soup.h2.text
content1 = ''.join(map(str, soup.select_one('.cB cB-def dictionary biling').contents))

然后我得到一个错误

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-84-e9cb11cd6b5d> in <module>
     10 
     11 entry_name = soup.h2.text
---> 12 content1 = ''.join(map(str, soup.select_one('.cB cB-def dictionary biling').contents))

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

另一方面，如果我替换cB cB-def dictionary biling by hom, i.e. content1 = ''.join(map(str, soup.select_one('.hom').contents))然后代码运行良好。从下面的html结构来看，我认为cB cB-def dictionary biling and hom非常相似。

您能详细说明一下这个问题是如何产生的以及如何解决吗？

尝试这个：

import requests
from bs4 import BeautifulSoup

url = 'https://www.collinsdictionary.com/dictionary/french-english/aimer'
headers = {'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0'}
soup = BeautifulSoup(requests.get(url, headers = headers).content, 'html.parser')

for script in soup.select('script, .hcdcrt, #ad_contentslot_1, #ad_contentslot_2'):
    script.extract()

entry_name = soup.h2.text
content1 = ''.join(map(str, soup.select_one('.cB.cB-def.dictionary.biling').contents))

当你选择班级时，它是blank-spaces在其中你将空格替换为..

cB, cB-def, dictionary and biling是四个不同的类。如果你让空格存在，脚本就会寻找带有 class 的标签cB-def在带有 class 的标签内部cB等等....