False negative import-error when the package imported is one of pylint's dependency

[Pierre-Sassoulas]

Bug description

When linting with pylint one must install pylint in its environment to be able to lint. So when pylint is providing a dependency that is not set in the project packaging, pylint does not raise import-error appropriately. For example for yaml:

import yaml

Then in an environment where pyyaml is not available this will fail.

Command used

pylint a.py

Pylint output

No error.

Expected behavior

E401: Unable to import yaml

Pylint version

A problem since forever, I guess.

[pavan-msys]

Hi @Pierre-Sassoulas

Version:

pylint 4.0.0-dev0
astroid 4.0.0a0
Python 3.10.12 (main, Feb  4 2025, 14:57:36) [GCC 11.4.0]

OS:
Ubuntu 22.04

I tested this in my environment, and it's working as expected