In another instance of Pants using the wrong Python version, we have in our

pants.toml

,

[black]
interpreter_constraints = ["==3.12.*"]

However, black gives us the following error:

Cannot parse: 51:67:                     f"Database name in config is {database_config["dbname"]}, "

This f-string is fine in 3.12. black must be incorrectly using the wrong version. This seems like a bug, right?

Shouldn't you escape the double quote around dbname? Or use single quotes

@refined-addition-53644 thanks for the response! But those are not needed in 3.12. See https://peps.python.org/pep-0701/

Well I need to keep up. Didn't know that! Thank you!

Do you have black configuration (eg in pyproject.toml)? If so, does that set the target version?

I have it in

pants.toml

(see above). I don't have a

pyproject.toml

.

Ah, okay. I think the config there is describing what interpreter to use to run the black process itself. It sounds like black doesn’t use its current interpreter as the default language version. Can you try setting https://black.readthedocs.io/en/stable/usage_and_configuration/the_basics.html#t-target-version ? Maybe like

[black]
…
args = [“--target-version=py312”]

@broad-processor-92400 thanks, this is useful - it seems like it really is something that Black is doing wrong itself. I looked at their issues, and indeed they don't support this yet: https://github.com/psf/black/issues/3746

Good to know!