bs4 FeatureNotFound Couldn t find a tree builder with the features you requested lxml Do you need to install a parser library

Question

soup   BeautifulSoup html   lxml   File   Library Python 2 7 site-packages bs4   init   py   line 152  in   init         join features   bs4 FeatureNotFound  Couldn t find a tree builder with the features you requested  lxml  Do you need to install a parser library    The above outputs on my Terminal  I am on Mac OS 10 7 x  I have Python 2 7 1  and followed this tutorial to get Beautiful Soup and lxml  which both installed successfully and work with a separate test file located here  In the Python script that causes this error  I have included this line      from pageCrawler import comparePages And in the pageCrawler file I have included the following two lines      from bs4 import BeautifulSoup     from urllib2 import urlopen  Any help in figuring out what the problem is and how it can be solved would much be appreciated

User · Answer

Although BeautifulSoup supports the HTML parser by default If you want to use any other third-party Python parsers you need to install that external parser like(lxml).

soup_object= BeautifulSoup(markup,"html.parser") #Python HTML parser

But if you don't specified any parser as parameter you will get an warning that no parser specified.

soup_object= BeautifulSoup(markup) #Warnning

To use any other external parser you need to install it and then need to specify it. like

pip install lxml

soup_object= BeautifulSoup(markup,'lxml') # C dependent parser

External parser have c and python dependency which may have some advantage and disadvantage.

User · Answer

I am using Python 3 6 and I had the same original error in this post  After I ran the command   python3 -m pip install lxml   it resolved my problem

User · Answer

In some references  use the second instead of the first   soup object  BeautifulSoup markup  html-parser   soup object  BeautifulSoup markup  html parser

User · Answer

I have a suspicion that this is related to the parser that BS will use to read the HTML   They document is here  but if you re like me  on OSX  you might be stuck with something that requires a bit of work   You ll notice that in the BS4 documentation page above  they point out that by default BS4 will use the Python built-in HTML parser   Assuming you are in OSX  the Apple-bundled version of Python is 2 7 2 which is not lenient for character formatting   I hit this same problem  so I upgraded my version of Python to work around it  Doing this in a virtualenv will minimize disruption to other projects   If doing that sounds like a pain  you can switch over to the LXML parser   pip install lxml   And then try   soup   BeautifulSoup html   lxml     Depending on your scenario  that might be good enough   I found this annoying enough to warrant upgrading my version of Python   Using virtualenv  you can migrate your packages fairly easily

User · Answer

For basic out of the box python with bs4 installed then you can process your xml with  soup   BeautifulSoup html   html5lib     If however you want to use formatter  xml  then you need to   pip3 install lxml  soup   BeautifulSoup html  features  xml

User · Answer

Instead of using lxml use html parser  you can use this piece of code   soup   BeautifulSoup html   html parser

User · Answer

I encountered the same issue  I found the reason is that I had a slightly-outdated python six package    gt  gt  gt  import html5lib Traceback  most recent call last   File   lt stdin gt    line 1  in  lt module gt    File   usr local lib python2 7 site-packages html5lib   init   py   line 16  in  lt module gt      from  html5parser import HTMLParser  parse  parseFragment   File   usr local lib python2 7 site-packages html5lib html5parser py   line 2  in  lt module gt      from six import with metaclass  viewkeys  PY3 ImportError  cannot import name viewkeys   Upgrading your six package will solve the issue   sudo pip install six 1 10 0

User · Answer

Actually 3 of the options mentioned by other work  1  soup object  BeautifulSoup markup  quot html parser quot    Python HTML parser     pip install lxml  soup object  BeautifulSoup markup  lxml     C dependent parser      pip install html5lib  soup object  BeautifulSoup markup  html5lib     C dependent parser

User · Answer

Install LXML parser in python environment    pip install lxml   Your problem will be resolve  You can also use built-in python package for the same as   soup   BeautifulSoup s    html parser     Note  The  HTMLParser  module has been renamed to  html parser  in Python3

User · Answer

Blank parameter will result in a warning for best available  soup   BeautifulSoup html   --------------- UserWarning  No parser was explicitly specified  so I m using the best available HTML parser for this system   html5lib    This usually isn t a problem  but if you run this code on another system  or in a different virtual environment  it may use a different parser and behave differently ----------------------   python --version  Python 3 7 7  PyCharm 19 3 4 CE

User · Answer

I d prefer the built in python html parser  no install no dependencies soup   BeautifulSoup s    quot html parser quot

User · Answer

The error is coming because of the parser you are using  In general  if you have HTML file code then you need to use html5lib documentation can be found here   amp  in-case you have XML file data then you need to use lxml documentation can be found here   You can use lxml for HTML file code also but sometimes it gives an error as above  So  better to choose the package wisely based on the type of data file  You can also use html parser which is built-in module  But  this also sometimes do not work    For more details regarding when to use which package you can see the details here

User · Answer

Run these three commands to make sure that you have all the relevant packages installed   pip install bs4 pip install html5lib pip install lxml   Then restart your Python IDE  if needed   That should take care of anything related to this issue

[python] bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

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