Hi, I have some lint questions. I got the black failed report as follows.

% pants lint ::
10:28:33.91 [INFO] Completed: Format with Black - black made no changes.
10:28:33.91 [INFO] Completed: Lint with Flake8 - flake8 succeeded.
Partition: ['CPython<4.0,>=3.8']


10:28:33.91 [INFO] Completed: Format with docformatter - docformatter made no changes.
10:28:33.91 [WARN] Completed: Format with Black - black made changes.
  src/python/text_streaming_service/text_streaming_service.py
  test/python/tests/text_streaming_service/test_text_streaming_service.py
10:28:33.92 [INFO] Completed: Format with isort - isort made no changes.

✕ black failed.
✓ docformatter succeeded.
✓ flake8 succeeded.
✓ isort succeeded.

(One or more formatters failed. Run `pants fmt` to fix.)

Then I run fmt:

% pants fmt ::
10:30:29.58 [WARN] Completed: Format with isort - isort made changes.
  src/python/text_streaming_service/text_streaming_service.py
  test/python/tests/text_streaming_service/test_text_streaming_service.py
10:30:29.58 [INFO] Completed: Format with docformatter - docformatter made no changes.
10:30:29.58 [WARN] Completed: Format with Black - black made changes.
  src/python/text_streaming_service/text_streaming_service.py
  test/python/tests/text_streaming_service/test_text_streaming_service.py
10:30:29.58 [INFO] Completed: Format with Black - black made no changes.

+ black made changes.
✓ docformatter made no changes.
+ isort made changes.

Then I ran

pants lint ::

again, but it still shows

black failed

. do you know why? And what the exact error black report?

Hard to tell without seeing the actual changes (and configuration possibly). But IIRC, there is some incompatibility between black's default behaviour and isort. I think black has a switch for isort compatibility.

Possibly not a helpful reply, but I've replaced black, isort and flake8 with ruff. It's so fast that i run it outside of pants across the whole repo in CI.

I can confirm what @breezy-twilight-65275 mentions. For clarity, try running

pants fmt --isort-skip ::

and then

git diff

and you should be able to see the changes made by

black

(which are getting reverted by `isort`; note your output from

fmt

has

black

making changes and then

isort

making changes after) Personally, I use

isort

with the

--profile=black

arg and that cleans up most confusion.

Thanks a lot. I will have a try

Glad it works for you!