[PR #12136/c0f1513c backport][3.13] Fix AttributeError: 'ClientConnectorCertificateError' object has no attribute '_os_error'.

[patchback]

This is a backport of PR #12136 as merged into master (c0f1513).

What do these changes do?

ClientConnectorCertificateError is a subclass of ClientConnectorError and should have all of its attributes (Liskov substitution principle). However, when I try to access the os_error attribute in my exception handler, I get the following exception:

AttributeError: 'ClientConnectorCertificateError' object has no attribute '_os_error'.

Are there changes in behavior for the user?

Users that use hasattr(e, 'os_error') to ensure that e is not an instance of ClientConnectorCertificateError (or its subclasses), will have their code broken.

Is it a substantial burden for the maintainers to support this?

There should be none.

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES/ folder

  • name it <issue_or_pr_num>.<type>.rst (e.g. 588.bugfix.rst)

  • if you don't have an issue number, change it to the pull request
    number after creating the PR

    • .bugfix: A bug fix for something the maintainers deemed an
      improper undesired behavior that got corrected to match
      pre-agreed expectations.
    • .feature: A new behavior, public APIs. That sort of stuff.
    • .deprecation: A declaration of future API removals and breaking
      changes in behavior.
    • .breaking: When something public is removed in a breaking way.
      Could be deprecated in an earlier release.
    • .doc: Notable updates to the documentation structure or build
      process.
    • .packaging: Notes for downstreams about unobvious side effects
      and tooling. Changes in the test invocation considerations and
      runtime assumptions.
    • .contrib: Stuff that affects the contributor experience. e.g.
      Running tests, building the docs, setting up the development
      environment.
    • .misc: Changes that are hard to assign to any of the above
      categories.

  • Make sure to use full sentences with correct case and punctuation,
    for example:

    Fixed issue with non-ascii contents in doctest text files
    -- by :user:`contributor-gh-handle`.

    Use the past tense or the present tense a non-imperative mood,
    referring to what's changed compared to the last released version
    of this project.

[codspeed-hq]

Merging this PR will not alter performance

✅ 59 untouched benchmarks

---

_{Comparing patchback/backports/3.13/c0f1513c37cb145b2618aeffd8f58d2f0cf230ab/pr-12136 (3acb89c) with 3.13 (57ac25b)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (57ac25b) to head (3acb89c).
⚠️ Report is 2 commits behind head on 3.13.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.13   #12147   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files         128      128           
  Lines       44685    44695   +10     
  Branches     2430     2431    +1     
=======================================
+ Hits        43919    43929   +10     
  Misses        590      590           
  Partials      176      176           

Flag	Coverage Δ
CI-GHA	98.16% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.92% <100.00%> (+<0.01%)	⬆️
OS-Windows	95.60% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.17% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	96.71% <100.00%> (+<0.01%)	⬆️
Py-3.10.19	97.19% <100.00%> (-0.01%)	⬇️
Py-3.11.14	97.39% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	96.90% <100.00%> (+<0.01%)	⬆️
Py-3.12.10	96.99% <100.00%> (+<0.01%)	⬆️
Py-3.12.12	97.48% <100.00%> (+<0.01%)	⬆️
Py-3.13.11	?
Py-3.13.12	97.70% <100.00%> (+0.73%)	⬆️
Py-3.14.2	?
Py-3.14.3	97.62% <100.00%> (+0.73%)	⬆️
Py-3.14.3t	96.72% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.60% <100.00%> (+<0.01%)	⬆️
Py-3.9.25	97.08% <100.00%> (+<0.01%)	⬆️
Py-pypy3.11.13-7.3.20	96.78% <100.00%> (+<0.01%)	⬆️
VM-macos	97.17% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.92% <100.00%> (+<0.01%)	⬆️
VM-windows	95.60% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.