CODEWITHSUNDEEP
pythonpython-2.7beautifulsouplxml
user3773048
user3773048

Reputation: 6219

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

...
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

How can this problem be solved?

Upvotes: 449

Views: 808860

Answers (22)

BrianBrain
BrianBrain

Reputation: 58

Important for Jupyternotebook-Users: If you decide for the lxml parser make sure to restart the jupyternotebook kernel after installing it with pip install lxml. Otherwise the parser can not be found as it is not yet inititalized properly. Restarting the kernel is possible via the jupyternotebook web/pycharm/vscode GUI.

Upvotes: 1

zabop
zabop

Reputation: 7832

pip install lxml then keeping xml in soup = BeautifulSoup(URL, "xml") did the job on Mac.

Upvotes: 6

Akira Rorschach
Akira Rorschach

Reputation: 105

You may want to double check that you're using the right interpreter if you have multiple versions of Python installed.

Once I chose the correct version of Python, lxml was found.

Upvotes: 1

Ayanabha
Ayanabha

Reputation: 51

BS4 by default expects an HTML document. Therefore, it parses an XML document as an HTML one. Pass features="xml" as an argument in the constructor. It resolved my issue.

Upvotes: 2

33Anika33
33Anika33

Reputation: 631

Actually 3 of the options mentioned by other work.

# 1. 
soup_object= BeautifulSoup(markup,"html.parser") #Python HTML parser

# 2. 
pip install lxml
soup_object= BeautifulSoup(markup,'lxml') # C dependent parser 

# 3.
pip install html5lib
soup_object= BeautifulSoup(markup,'html5lib') # C dependent parser

Upvotes: 50

Shivam Baldha
Shivam Baldha

Reputation: 56

I fixed with below changes

Before changes

soup = BeautifulSoup(r.content, 'html5lib' )
print (soup.prettify())

After change

soup = BeautifulSoup(r.content, features='html')
print(soup.prettify())

my code works properly

Upvotes: 1

abbas abaei
abbas abaei

Reputation: 73

This method worked for me. I prefer to mention that I was trying this in the virtual environment. First:

pip install --upgrade bs4

Secondly, I used:

html.parser

instead of

html5lib

Upvotes: 0

blizz
blizz

Reputation: 4168

In my case I had an outdated version of the lxml package. So I just updated it and this fixed the issue.

sudo python3 -m pip install lxml --upgrade

Upvotes: 5

Jd_mahmud
Jd_mahmud

Reputation: 41

I am using python 3.8 in pycharm. I assume that you had not installed "lxml" before you started working. This is what I did:

  1. Go to File -> Settings
  2. Select " Python Interpreter " on the left menu bar of settings, select "Python Interpreter."
  3. Click the "+" icon over the list of packages.
  4. Search for "lxml."
  5. Click "Install Package" on the bottom left of the "Available Package" window.

Upvotes: 1

PBH
PBH

Reputation: 1078

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.

Upvotes: 8

MJimitater
MJimitater

Reputation: 939

My solution was to remove lxml from conda and reinstalling it with pip.

Upvotes: 1

Ernst
Ernst

Reputation: 1263

I'd prefer the built in python html parser, no install no dependencies

soup = BeautifulSoup(s, "html.parser")

Upvotes: 122

Shankar Vishnu
Shankar Vishnu

Reputation: 251

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

Upvotes: 20

Pikamander2
Pikamander2

Reputation: 8299

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.

Upvotes: 66

user176105
user176105

Reputation: 19

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

Upvotes: 1

Pranav Bhendawade
Pranav Bhendawade

Reputation: 315

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) & 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

Upvotes: 1

James Errico
James Errico

Reputation: 6226

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.

Upvotes: 477

abhishekPakrashi
abhishekPakrashi

Reputation: 23

In some references, use the second instead of the first:

soup_object= BeautifulSoup(markup,'html-parser')
soup_object= BeautifulSoup(markup,'html.parser')

Upvotes: 1

Yogesh
Yogesh

Reputation: 1432

Instead of using lxml use html.parser, you can use this piece of code:

soup = BeautifulSoup(html, 'html.parser')

Upvotes: 14

Bashar
Bashar

Reputation: 191

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

Upvotes: 19

Qiao Yang
Qiao Yang

Reputation: 39

I encountered the same issue. I found the reason is that I had a slightly-outdated python six package.

>>> import html5lib
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/site-packages/html5lib/__init__.py", line 16, in <module>
    from .html5parser import HTMLParser, parse, parseFragment
  File "/usr/local/lib/python2.7/site-packages/html5lib/html5parser.py", line 2, in <module>
    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

Upvotes: 3

Tim Seed
Tim Seed

Reputation: 5279

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")

Upvotes: 65

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