hashlib constructors unexpected-argument false positive for usedforsecurity

[OJFord]

Bug description

Python 3.9 added the usedforsecurity keyword-only argument to all hashlib constructors

Configuration

No response

Command used

pylint

Pylint output

E1123: Unexpected keyword argument 'usedforsecurity' in constructor call (unexpected-keyword-arg)

Expected behavior

No error

Pylint version

pylint 3.0.0-a4

OS / Environment

No response

Additional dependencies

No response

[Pierre-Sassoulas]

Thank you for opening the issue. Could you try with the latest pylint <3 ? 3.0.0 alpha 4 is based on an old version of pylint like 2.10 with breaking change on top of it.

[OJFord]

Thanks for the reply - I think it might actually be that python3.8 was (unexpectedly) picked up, in which case the error is correct. Will close once I've confirmed that.

[LuminairPrime]

Unexpected keyword argument 'usedforsecurity' in constructor call

from hashlib import blake2b
blake2bhash = blake2b(digest_size=10, usedforsecurity=False)

pylint --version
pylint 2.12.2
astroid 2.9.3
Python 3.10.1 (tags/v3.10.1:2cd268a, Dec  6 2021, 19:10:37) [MSC v.1929 64 bit (AMD64)]

[OJFord]

Thanks @LuminairPrime, I see the same. Mypy correctly complains in 3.8 but not in 3.9 or 3.10, pylint complains regardless of version.

I take it pylint doesn't use typeshed then, from which mypy gets the (version-switched) correct signature?

[Pierre-Sassoulas]

pylint uses astroid to create the abstract syntax tree. It's possible there's an issue in astroid not being able to create the proper AST for the python 3.9 code.

[OJFord]

Thanks! (Aside: didn't realise you could close cross-repo like that now, nice!)