[ruff] Handle extra arguments to deque (RUF037)#18614
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MichaReiser
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Jun 11, 2025
| 65 65 | def f(): | ||
| 66 66 | deque([], *[10]) # RUF037 but no fix | ||
| 67 |- deque([], **{"maxlen": 10}) # RUF037 | ||
| 67 |+ deque(**{"maxlen": 10}) # RUF037 |
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Very nit picky, but I think this is unsafe if the dict contains an iterable keyword. The same if there are any other keywords around:
>>> from collections import deque
>>> a = deque(iterable=[1, 2])
>>> list(a)
[1, 2]
>>> list(a)
KeyboardInterrupt
>>> a = deque([1], iterable=[1, 2])
Traceback (most recent call last):
File "<python-input-6>", line 1, in <module>
a = deque([1], iterable=[1, 2])
TypeError: argument for deque() given by name ('iterable') and position (1)
We should mark the fix as unsafe if there are any other arguments.
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Wow nice catch! I added this case:
def f():
deque([], iterable=[])and realized that I was mishandling the range passed to remove_argument because this was returning an Err! I was only passing the ArgOrKeyword::value not the whole ArgOrKeyword.
I fixed that, and then also marked the fix unsafe if we find an unrecognized number of arguments.
MichaReiser
approved these changes
Jun 11, 2025
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Summary
Fixes #18612 by:
*args, which I don't think we can fix reliablyEdit::deletionfromremove_argumentinstead of anEdit::range_replacementin the presence of unrecognized keyword argumentsI thought we could always switch to the
Edit::deletionapproach initially, but it caused problems whenmaxlenwas passed positionally, which we didn't have any existing tests for.The replacement fix can easily delete comments, so I also marked the fix unsafe in these cases and updated the docs accordingly.
Test Plan
New test cases derived from the issue.
Stabilization
These are pretty significant changes, much like those to PYI059 in #18611 (and based a bit on the implementation there!), so I think it probably makes sense to un-stabilize this for the 0.12 release, but I'm open to other thoughts there.