"# noqa" is ignored when per-file-ignores is provided

[DmytroLitvinov]

Hi there.
I am trying to integrate ruff as a possible replacement of flake8 and I see that behavior of per-file-ignores option is not the same as in flake8.

• flake8 settings

[flake8]
max-line-length = 120
per-file-ignores =
    __init__.py:F401,F403

flake8 respects noqa in that case, but not ruff. Not sure is it expected behavior for ruff or not?

• Code snippet to reproduce the issue:

# __init__.py file
"""
See what is changed since then - https://github.com/ui/django-post_office/compare/3fead089a4e7e7fc2ae5ab56383f4ebf64c8777b...master  # noqa: E501
After you adapt it, then please change hash commit in url.
"""

• Ruff settings:

# pyproject.toml
[tool.ruff]
line-length = 120
# Sync with flake8 configuration
[tool.ruff.per-file-ignores]
"__init__.py" = ["F401", "F403"]

• Ruff version: 0.0.261
• Ruff issue: __init__.py:2:121: E501 Line too long (144 > 120 characters)

[DmytroLitvinov]

As far as I see right now also, it is not about per-file-ignores option, but because of docstrings.

"""
# docsting.py
https://github.com/robbitt07/django_boilerplate/blob/fcd03f03e9e9e54088cf69cd3c4bc83eabfd2666/utils/storage_backends.py#L8  # noqa: E501
"""

Issue: docstring.py:2:121: E501 Line too long (138 > 120 characters)

[charliermarsh]

Yeah that's correct -- we don't support # noqa comments within multi-line strings. There's a note on it here. Instead, we respect # noqa comments at the end of docstrings, like:

"""
# docsting.py
https://github.com/robbitt07/django_boilerplate/blob/fcd03f03e9e9e54088cf69cd3c4bc83eabfd2666/utils/storage_backends.py#L8 
"""  # noqa: E501

Flake8 respects either variant, so changing this should retain Flake8 compatibility.