Loop variable use in closure not considered
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enhancement
help wanted
- Dominant language
- Python
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Description
Running
flake8==3.9.2
flake8-bugbear==21.4.3
flake8-polyfill==1.0.2
flake8-quotes==3.2.0
on
def main():
def f(x):
print(i, x)
for i in [1, 2, 3]:
f('HI')
gives me
bugbearbug.py:5:9: B007 Loop control variable 'i' not used within the loop body. If this is intended, start the name with an underscore.
Clearly, i is being used (within the nested function), but bugbear doesn't seem to see it.
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the reported B007 warning with the provided nested-function example and the listed flake8-bugbear versions. Trace how B007 determines whether a loop variable is used, then add coverage showing that use within the nested function is recognized and confirm the warning is no longer emitted for this example.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100