Hello! I’m running

pants fix ::

on my repository, and Black fails with the following error:

ProcessExecutionFailure: Process 'Run Black on 2 files.' failed with exit code 123.
stdout:

stderr:
error: cannot format v1/main.py: cannot use --safe with this file; failed to parse source file AST: invalid syntax (<unknown>, line 17)
This could be caused by running Black with an older Python version that does not support new syntax used in your source file.

Oh no! 💥 💔 💥
1 file left unchanged, 1 file failed to reformat.

Relevant Config: • Pants version: 2.24.2 • Backends:

python

,

mypy

,

autoflake

,

black

,

isort

• Interpreter constraints: ◦ `python-default`: CPython 3.10.15 ◦ `v2`: CPython 3.11.11 • Resolves: ◦

python-default

→ 3.10.15 ◦

v2

→ 3.11.11 ◦

mypy

→ Separate resolve • Source roots:

/v1

,

/v2

I think black defaults to using python 3.8 or 3.9 which does not support

match

statements, which is where it is breaking. So I created a lockfile for black with just the black requirement and it is still failing. How can I make sure black runs with the proper python for the partition? Thanks!