PyLint return non-zero code error only if errors are there

Question

I am trying to run PyLint and need a setup where it only fails if the SEVERITY='ERROR' and also I still want to see and logs as in all severity level messages. I tried with --fail-on=E but it still fails. I run the command below:

pipenv run python3 -m pylint --fail-on=E src/app src/backend --output-format=teamcity.pylint_reporter.TeamCityReporter

Currently I get this error: Error 28

Is there a way to achieve this?

Answer 1

The pylint exit code is byte encoded depending on what was raised:

Fatal (1)
Error (2)
Warning (4)
Convention (8)
Refactor (16)
Information (NA)

See https://pylint.readthedocs.io/en/latest/user_guide/messages/index.html

It means in your case an okay output would be 4 (warning only), 8 (convention only), 12 (warning and convention), 16 (refactor only), 20 (warning and refactor), 24 (convention and refactor), or 28 (convention refactor and warning).

Answer 2

It might still fail when other messages are printed because all messages lower the score. The default behaviour is: if the score is less than 10, the exit code will be non-zero — see --fail-under:

Specify a score threshold under which the program will exit with error.

Default: 10

To get it to only fail on errors, but still show other messages, try this:

pylint src/app --fail-under 5 --fail-on E