Can I use environment vars in

[pylint].args

?

[pylint]
args = [
  "--jobs=${PYLINT_CONCURRENCY:-1}",
]
[subprocess-environment]
env_vars.add = [
  "PYLINT_CONCURRENCY",
]

It looks like I can't use shell syntax, so is there another way?

pex: error: option --jobs: invalid integer value: '${PYLINT_CONCURRENCY:-1}'

I'd love this feature and proposed it last year: https://github.com/pantsbuild/pants/issues/10399. Note tho that it's unlikely we would support Bash syntax w/ that default, as instead the Python code would read from

os.environ

In the meantime, you can set the option as an env var like

PANTS_PYLINT_ARGS="+[\"--jobs=${PYLINT_CONCURRENCY:-1}\"]"

(ack that is annoying to not have in a config file)

Hmm. OK, that can work in CI for now.

If you have any thoughts on this, it'd be helpful to add to https://github.com/pantsbuild/pants/issues/10399. What should happen in

pants.toml

if you specify an env var and it's not in

os.environ

? Error? Allow you to set a default with something like

${ENV_VAR:default}

?

Oh sweet. I just discovered (by surfing pylint's code) that I can use

--jobs=0

to make pylint autodetect the number of processors available.