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Don't flag redefined-while-unused in if branches #9418

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merged 1 commit into from
Jan 8, 2024

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@charliermarsh charliermarsh commented Jan 7, 2024

Summary

On main, we flag redefinitions in cases like:

import os

x = 1

if x > 0:
    import os

That is, we consider these to be in the "same branch", since they're not in disjoint branches. This matches Flake8's behavior, but it seems to lead to false positives.

@charliermarsh charliermarsh changed the title Don't flag redefined-while-unsed in if branches Don't flag redefined-while-unsed in if branches Jan 7, 2024
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Just looking at # noqa: F811 usages in Code Search... At present, we often flag redefinitions within conditionals, and I don't see why we should:

with safe_import() as exc:
    import cffi
if exc.error:
    cffi = None  # noqa: F811
from kivy.core.window import Window
from kivy.metrics import dp
from kivy.utils import platform

if "KIVY_DOC_INCLUDE" in os.environ:
    dp = lambda x: x  # NOQA: F811

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Enforcing this is also the source of the bug we introduced in #2044.

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github-actions bot commented Jan 7, 2024

ruff-ecosystem results

Linter (stable)

ℹ️ ecosystem check detected linter changes. (+2 -0 violations, +0 -0 fixes in 2 projects; 41 projects unchanged)

apache/airflow (+1 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-preview --select ALL

+ tests/www/views/test_views_rendered.py:259:55: RUF100 [*] Unused `noqa` directive (unused: `F811`)

bokeh/bokeh (+1 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-preview --select ALL

+ src/bokeh/embed/util.py:143:32: RUF100 [*] Unused blanket `noqa` directive

Changes by rule (1 rules affected)

code total + violation - violation + fix - fix
RUF100 2 2 0 0 0

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+2 -0 violations, +0 -0 fixes in 2 projects; 41 projects unchanged)

apache/airflow (+1 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --preview --select ALL

+ tests/www/views/test_views_rendered.py:259:55: RUF100 [*] Unused `noqa` directive (unused: `F811`)

bokeh/bokeh (+1 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --preview --select ALL

+ src/bokeh/embed/util.py:143:32: RUF100 [*] Unused blanket `noqa` directive

Changes by rule (1 rules affected)

code total + violation - violation + fix - fix
RUF100 2 2 0 0 0

@charliermarsh charliermarsh changed the title Don't flag redefined-while-unsed in if branches Don't flag redefined-while-unused in if branches Jan 7, 2024
@charliermarsh charliermarsh added the rule Implementing or modifying a lint rule label Jan 7, 2024
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Enforcing this would also resolve the bug introduced in #5561 (comment).

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Perhaps this should be preview though.

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@zanieb zanieb left a comment

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I think this is okay without preview since it's a reduction in scope; unless you think it is possible we will revert.

@charliermarsh charliermarsh merged commit 985f1d1 into main Jan 8, 2024
17 checks passed
@charliermarsh charliermarsh deleted the charlie/same-branch branch January 8, 2024 22:06
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2 participants