How to get rid of BeautifulSoup user warning?

Documentation recommends that you install and use lxml for speed.

BeautifulSoup(html, "lxml")

If you’re using a version of Python 2 earlier than 2.7.3, or a version of Python 3 earlier than 3.2.2, it’s essential that you install lxml or html5lib–Python’s built-in HTML parser is just not very good in older versions.

Installing LXML parser

• On Ubuntu (debian)

  apt-get install python-lxml 
  

• Fedora (RHEL based)

  dnf install python-lxml
  

• Using PIP

  pip install lxml
  

The solution to your problem is clearly stated in the error message. Code like the below does not specify an XML/HTML/etc. parser.

BeautifulSoup( ... )

In order to fix the error, you'll need to specify which parser you'd like to use, like so:

BeautifulSoup( ..., "html.parser" )

You can also install a 3rd party parser if you'd like.