VERIFIED

pycqa__pyflakes-335

VERIFIED on first verdict

1 attempt, 0 appeals. 1 file, 3 added and 1 removed lines. Tokens: 32,796 tokens. Model cost: $0.01. Sandbox time: 45 s.

Open receipt

The plan

Repository: pycqa/pyflakes
Base commit: 4b2d720 (image tag)
Issue: Ignore "_" vars in "Unused Variable" check *Original report by [archardlias](https://launchpad.net/~archardlias) on [Launchpad](https://bugs.launchpad.net/bugs/1328169):* ------------------------------------ Would it be possible to ignore variables named "_" from "Unused Variable" checks?

Files to edit

pyflakes/checker.py

Approach: Locate where `UnusedVariable` messages are generated—likely during symbol table cleanup after analyzing assignments. Skip adding the message if the variable name equals `'_'.

Attempt 1

VERIFIED

Agent branch

Kind	Command	Duration	Digest
command	`git ls-files -z` exact command git ls-files -z	0.004s	65fc4f43
command	`grep -n "UnusedVariable" pyflakes/checker.py` exact command grep -n "UnusedVariable" pyflakes/checker.py	0.003s	cab2d9c9
write	`write pyflakes/checker.py` exact command /opt/receipts-2616b69533244646b48b2092055732c4/bin/busybox sh -c 'mkdir -p /pyflakes/pyflakes && cp /opt/receipts-2616b69533244646b48b2092055732c4/incoming/749d846b305f40070515fda5b322f7197006407c1496d62dec6ee66531da5d73 /pyflakes/pyflakes/checker.py'	0.005s	ea3ae0c8
write	`write pyflakes/checker.py` exact command /opt/receipts-21cf152af9fd4978b644dbbdc8aed610/bin/busybox sh -c 'mkdir -p /pyflakes/pyflakes && cp /opt/receipts-21cf152af9fd4978b644dbbdc8aed610/incoming/99eee274cfdc697128c5095b03179626ba2b50369f9c5b0fb4c7c956a51ed4bc /pyflakes/pyflakes/checker.py'	0.005s	57085e1b
command	`pytest pyflakes/test/test_other.py::TestUnusedAssignment::test_unusedUnderscoreVariable -xvs` exact command /opt/receipts-0ca10b1d0c1344a088ac832019ef57f3/bin/busybox mkdir -p /opt/receipts/reports && python -I /opt/receipts-0ca10b1d0c1344a088ac832019ef57f3/receipts_pytest.py pyflakes/test/test_other.py::TestUnusedAssignment::test_unusedUnderscoreVariable -xvs -o junit_family=xunit1 -p no:cacheprovider -rA --continue-on-collection-errors --junitxml=/opt/receipts/reports/agent1-5.xml	0.207s	1de1af7c5317
command	`pytest pyflakes/test/test_imports.py pyflakes/test/test_other.py` exact command /opt/receipts-3cfa8400444240adaab69f893efad460/bin/busybox mkdir -p /opt/receipts/reports && python -I /opt/receipts-3cfa8400444240adaab69f893efad460/receipts_pytest.py --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning pyflakes/test/test_imports.py pyflakes/test/test_other.py -o junit_family=xunit1 -p no:cacheprovider -rA --continue-on-collection-errors --junitxml=/opt/receipts/reports/agent1-6.xml	0.536s	1de1af7c5317
diff	`capture patch` exact command compute patch in executor staging agent1-b2a9e95660314f4cb441d0175e3cb01c: /opt/homebrew/Cellar/git/2.53.0/bin/git -c core.hooksPath=/dev/null -c core.attributesFile=/dev/null -c diff.external= -c core.quotePath=false add -A && /opt/homebrew/Cellar/git/2.53.0/bin/git -c core.hooksPath=/dev/null -c core.attributesFile=/dev/null -c diff.external= -c core.quotePath=false diff --cached --binary --no-ext-diff --no-textconv --no-renames 2135f62143844ec1d8839a0b9d7d9a98cd09d096	0.057s	1de1af7c5317

Finish summary: Modified pyflakes/checker.py to skip reporting UnusedVariable for variables named '_'.
Worker outcome: finished

Target tests pass: yes
Full suite passes: yes
Files changed: pyflakes/checker.py
Ran tests: yes

Witness branch w1

Kind Command Exit Duration Digest

apply

Kind	Command	Exit	Duration	Digest
apply	`apply patch a026c1f23a38` exact command git update-index -q --refresh; git apply -v --3way --recount --ignore-space-change --whitespace=nowarn /opt/receipts-b932db83a7b94d29b4e864df9929046d/incoming/a026c1f23a3873634a27c1481fa8b153dde291b15c8497c05f6adf6346a67122.diff	0	0.009s	1de1af7c5317
verification	`pytest (witness) pyflakes/test/test_imports.py pyflakes/test/test_other.py` exact command /opt/receipts-a438b95873454c5c8481b52eddc2c885/bin/busybox mkdir -p /opt/receipts/reports && python -I /opt/receipts-a438b95873454c5c8481b52eddc2c885/receipts_pytest.py --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning pyflakes/test/test_imports.py pyflakes/test/test_other.py -o junit_family=xunit1 -p no:cacheprovider -rA --continue-on-collection-errors --junitxml=/opt/receipts/reports/w1-2.xml	0	0.513s	1de1af7c5317

apply patch a026c1f23a38

exact command

git update-index -q --refresh; git apply -v --3way --recount --ignore-space-change --whitespace=nowarn /opt/receipts-b932db83a7b94d29b4e864df9929046d/incoming/a026c1f23a3873634a27c1481fa8b153dde291b15c8497c05f6adf6346a67122.diff

0.009s

1de1af7c5317

verification

pytest (witness) pyflakes/test/test_imports.py pyflakes/test/test_other.py

exact command

/opt/receipts-a438b95873454c5c8481b52eddc2c885/bin/busybox mkdir -p /opt/receipts/reports && python -I /opt/receipts-a438b95873454c5c8481b52eddc2c885/receipts_pytest.py --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning pyflakes/test/test_imports.py pyflakes/test/test_other.py -o junit_family=xunit1 -p no:cacheprovider -rA --continue-on-collection-errors --junitxml=/opt/receipts/reports/w1-2.xml

0.513s

1de1af7c5317

Gate predicate checklist

Predicate	Name	Status	Evidence
`R1_fail_to_pass`	Failing specification tests now pass	PASS	target tests passed: pyflakes/test/test_other.py::TestUnusedAssignment::test_unusedUnderscoreVariable
`R2_pass_to_pass`	Previously passing tests kept	PASS	235 baseline-passing tests still pass
`R3_no_shrink`	No removed tests or new skips	PASS	all 244 baseline tests collected; skips unchanged (8)
`R4_patch_scope`	Patch scope	PASS	patch touches 1 file(s), all in scope
`R5_provenance`	Witness chain and patch digest	PASS	agent chain c01f74c1 -> c1454f43 unbroken over 7 receipt(s); witness chain c01f74c1 -> 9ce7e838 unbroken over 2 receipt(s); applied digest matches
`R6_claim_audit`	Agent claim audit (advisory)	PASS	claimed green; own last run: 236 passed, 0 failed

What it said

Finish summary: Modified pyflakes/checker.py to skip reporting UnusedVariable for variables named '_'.
Worker outcome: finished

Target tests pass: yes
Full suite passes: yes
Files changed: pyflakes/checker.py
Ran tests: yes

What the record shows

honest: claimed green; own last run: 236 passed, 0 failed

SWE-rebench's official grader: resolved

Agrees with the gate

Shipped patch

diff --git a/pyflakes/checker.py b/pyflakes/checker.pyindex bd5eba5..a41980e 100644--- a/pyflakes/checker.py+++ b/pyflakes/checker.py@@ -1235,6 +1235,8 @@ class Checker(object):                 Check to see if any assignments have not been used.                 """                 for name, binding in self.scope.unusedAssignments():+                    if name == "_":+                        continue                     self.report(messages.UnusedVariable, binding.source, name)             self.deferAssignment(checkUnusedAssignments) @@ -1414,7 +1416,7 @@ class Checker(object):         except KeyError:             pass         else:-            if not binding.used:+            if not binding.used and node.name != "_":                 self.report(messages.UnusedVariable, node, node.name)          # Restore.

Model and costs

Model: NVIDIA Nemotron 3 Super thinking off · temperature 1.0 · top_p 0.95
Tokens: 32,796 tokens
Model cost: $0.01
Sandbox time: 45 s
Sandbox cost: Token Factory reported cost: 0.032 (unit not published)

Full environment disclosure

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The bundle

Recorded JSON and patches. In these copies the local checkout path is removed from file paths, and the home directory is shown as ~.