在美丽的汤上获得导入错误

Question

所以我想了解网页解析，我是初学者。我已经安装了漂亮的汤，以下是我的代码

import bs4 as bs
import urllib.request

source_code = urllib.request.urlopen('https://pythonprogramming.net/parsememcparseface/').read()
soup = bs.Beautifulsoup(source_code, 'lxml')
print(soup)

然而，当我运行这个时，我收到了一个错误

 File "C:\Users\my dell\AppData\Local\Programs\Python\Python36-32\lib\site-packages\bs4\__init__.py", line 30, in <module>
from .builder import builder_registry


 File "C:\Users\my dell\AppData\Local\Programs\Python\Python36-32\lib\site-packages\bs4\builder\__init__.py", line 7, in <module>
    from bs4.element import (
ImportError: cannot import name 'CharsetMetaAttributeValue'