/usr/bin/pylint starts with the line:

#! /usr/bin/python3 -sP

The -s option tells the Python not to add user site directory to sys.path. This obstructs checking of programs developed by the user. In my opinion the -s option should be removed.

Reproducible: Always

Steps to Reproduce:
1. select a python library/package name for testing,

   either na existing one from the output of:
       pip list --user

   or install from Pypi any arbitrary one not already present,
   preferrably small and without dependencies.
   I'm using a tiny utility "jsonstrip" just as an example:
       pip install --user jsonstrip

2. create a test.py file containing just the line "import jsonstrip",
   it is a correct python program albeit completely useless

3. verify that the program runs without errors:
      python test.py

4. run pylint test.py

5. (cleanup: remove test.py and uninstall jsonstrip)
Actual Results:  
pylint shows (among other lines):

   Unable to import 'jsonstrip' (import-error)

That is not true, see the step #3.

Expected Results:  
pylint should be able to import user-installed packages.