If you use Python virtualenv, pylint and lxml together, you may see error messages in pylint test results. It`s because only trusted C extension resources (the standard library) should be used. Here is an opportunity to improve the pylint test results.

Generate a .pylintrc file

# generate .pylintrc file
$ pylint --generate-rcfile > .pylintrc

Open the .pylintrc file to edit

# open with vim editor
$ vim .pylintrc

Add lxml to extension-pkg-whitelist

# A comma-separated list of package or module names from where C extensions may
# be loaded. Extensions are loading into the active Python interpreter and may
# run arbitrary code
extension-pkg-whitelist=lxml

If you now perform the pylint test again, no error relating to lxml should appear.