Fix warnings

[dawmd]

Address warnings pointed out in CI.

Backport: not necessary. This PR simply fixes some warnings.

Pre-review checklist

• I have split my patch into logically separate commits.
• All commit messages clearly explain what they change and why.
• (N/A) I added relevant tests for new features and bug fixes.
• All commits compile, pass static checks and pass test.
• PR description sums up the changes and reasons why they should be introduced.
• (N/A) I have provided docstrings for the public items that I want to introduce.
• (N/A) I have adjusted the documentation in ./docs/source/.
• (N/A) I added appropriate Fixes: annotations to PR description.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: QUIET

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Run ID: 4a4b7f29-5ff0-443a-ae11-c3ec985643a8

📥 Commits

Reviewing files that changed from the base of the PR and between bbd4f05 and 37d56e9.

📒 Files selected for processing (3)

• tests/integration/__init__.py
• tests/unit/io/utils.py
• tests/unit/test_exception.py

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📝 Walkthrough

Walkthrough

The changes update two regex declarations to raw string literals and change the pending-callback loop from identity comparison to value comparison. Matching behavior and callback-loop behavior remain unchanged.

Suggested labels: area/Driver_-_python-driver

Suggested reviewers: copilot

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the main change: fixing CI warnings.
Description check	✅ Passed	The description summarizes the warning fixes, explains the backport decision, and includes the complete checklist.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[Copilot]

Pull request overview

Fixes Python warnings without changing runtime behavior.

Changes:

• Uses raw strings for regex patterns.
• Replaces an integer identity comparison with a value comparison.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/unit/test_exception.py	Fixes regex escape warnings.
tests/unit/io/utils.py	Fixes improper integer identity comparison.
tests/integration/__init__.py	Fixes regex escape warnings.

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[dawmd]

The CI failure is #965. I sent a fix: #966.