Ruff152

[inducer]

Closes #345

[Copilot]

Pull request overview

This PR appears focused on addressing updated Ruff lint/type-checking expectations (and a few small refactors) across pytools, including typing-variance cleanup and targeted lint suppressions.

Changes:

• Updated typing TypeVar names to explicitly encode variance (e.g., T_co, R_co) and propagated through public type aliases/signatures.
• Added/adjusted Ruff configuration and inline noqa suppressions for intentional exec usage and self-comparison patterns.
• Minor cleanups/refactors in tests and small runtime code paths (e.g., simplifying returns, using extend with a generator).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
pytools/test/test_pytools.py	Switches object-array imports to from pytools import obj_array.
pytools/test/test_persistent_dict.py	Refactors assertions to use loop values directly; adds a Ruff suppression for NaN self-compare.
pytools/py_codegen.py	Adds # noqa: S102 on intentional exec calls.
pytools/prefork.py	Simplifies wait() implementation.
pytools/obj_array.py	Renames T → T_co and updates many typing signatures/type aliases accordingly.
pytools/datatable.py	Uses extend with a generator in join() to build result rows.
pytools/__init__.py	Renames R → R_co, updates generics, and performs small return simplifications.
pyproject.toml	Expands Ruff ignore list and adds per-file ignores for S102.
.basedpyright/baseline.json	Updates baseline positions to reflect new typing changes.

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