Hi All, may I ask what should I do if my pants bootstraps with wrong version of python? In pants.toml I have:

[python]
enable_resolves = true
interpreter_constraints = ["CPython==3.10.*"]

And I have python3.10 installed:

python --version

Python 3.10.12

But when I run any pants command , I got:

Bootstrapping Pants using /usr/bin/python3.8

It worked before, but today after I ran ./pants fmt , it’s broken.

Pants itself is a python application. That message is about Pants's own bootstrapping. The constraints you set are for your code, and don't change Pants's own execution

Thanks! So how can I force pants to use another python version?

You don't. Pants has compiled bits specific to a python version. Is there a reason you want to use a different version?

No specific reason, but I’m just curious why it changed python version suddenly. I just upgrade my system python in /usr/bin/python from 3.8 to 3.10 and now pants is using python in

/.pyenv/shims/python3.9

which solved my problem in a weird way...

Are you using the

pants

binary launcher? (e.g. not using

./pants

) It downloads and provides Python for Pants (and only Pants)

no I'm using ./pants

Ah, then

pants

is for you 🙂 https://www.pantsbuild.org/docs/installation

We are using pants check in our pre-commit process, installing the binary launcher won't break it ,right?

shouldn't 🙂

Got it , thanks!