Failure to recognize too many blank lines

[facundobatista]

Check the following code:

a = 100



b = 100

Flake8 will report E303 too many blank lines (3) but ruff passes silently.

$ fades -d flake8 -x flake8 --version
6.0.0 (mccabe: 0.7.0, pycodestyle: 2.10.0, pyflakes: 3.0.1) CPython 3.10.6 on Linux
$ fades -d flake8 -x flake8 x.py 
x.py:5:1: E303 too many blank lines (3)
$
$ fades -d ruff -x ruff --version
ruff 0.0.138
$ fades -d ruff -x ruff x.py 
$ 

[charliermarsh]

We don't support E303 right now, so this is expected.

[facundobatista]

Will you support it in the future? Thanks!

[facundobatista]

The README says

"""
Ruff can be used as a drop-in replacement for Flake8 when used (1) without or with a small number of plugins, (2) alongside Black, and (3) on Python 3 code.

Under those conditions, Ruff implements every rule in Flake8, with the exception of F811.
"""

Are there other missing codes in comparison to flake8? Thanks!

[charliermarsh]

I might! The thing with E303 and other rules is that, IIUC, if you run Black over your code, it's effectively impossible to trigger them. Given Black's popularity, I intentionally deprioritized stylistic rules that are already fixed by Black. Eventually, I'd like to extend Ruff to do autoformatting which would effectively include automatically fixing those lint errors.

[charliermarsh]

Closing in favor of #1073.