Buildifier does not support f-strings

[cbarrete]

Buck2 supports f-string (although Bazel does not, at least yet), so it would be nice if buildifier did not consider them invalid syntax.

Currently, running it over:

name = "Cédric"
print(f"Hello, {name}!")

gives

> buildifier asdf.bzl
asdf.bzl:2:24: syntax error near "Hello, {name}!"
asdf.bzl # reformat

It seems like this could be implemented quite easily similarly to raw strings, is this correct?

[vladmos]

That's correct, however the linter check for unused variables also need to be updated (e.g. the following code shoudln't issue warnings):

def f():
    foo = 'bar'
    return f'{foo}'

[aryandutt]

It looks like a good first issue, can I work on it?

[github-actions]

Thank you for contributing to the Bazel Buildtools repository!
In order to provide better support for buildtools in 2026 we are currently cleaning up old issues and pull requests.
This issue has been marked as stale since it has not had any activity in the last 1+ years. It will be closed in the next 90 days unless any other activity occurs. If you think this issue is still relevant and should stay open, please post any comment here and the issue will no longer be marked as stale.

[cbarrete]

This is still an issue.

[nmedveditsko-nvidia]

This has been addressed in #1465. Please share what you think.

[cbarrete]

Nice, thank you!
I will try to test this when I have a bit of time.

[nmedveditsko-nvidia]

@cbarrete - did you have a chance to take a look?