I'm trying to use py 3.9 for pants running in-repo. I'm getting

native_engine.so: undefined symbol: PyObject_VectorcallMethod

. I tried wiping that

.so

as well as

src/rust/engine/target

no dice Using

PY=python3.9 ./pants ...

Just checking the obvious - when you wiped those you then observed a re-build of the rust code?

i vaguely remember in the past having to wipe ~/.cache/pants for some reason

@enough-analyst-54434 yup

When I ran into this problem while using RuleRunner, it turned out that pants was grabbing the wrong python install - sometimes. Specifically, it was grabbing a python install in my xcode directory - had the same set of problems

Doing this worked 🤔

[python-bootstrap]
search_path = ["/usr/bin"]

[python]
interpreter_constraints = [">=3.9,<3.10"]

In a

.pants.rc

?

yup

I've been looking briefly into some of the new PyOx tools that have come out, trying to figure out what could be appropriate - but I think we're waiting on a couple fixes inside the tool