gh-115032: Deprecate support for custom logging handlers with 'strm' argument.

[felixxm]

• Issue: Deprecate old backward compatible shims in configure_formatter()/handler(). #115032

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📚 Documentation preview 📚: https://cpython-previews--115314.org.readthedocs.build/

[adamchainz]

Needs retargeting for 3.14 but looks like a good cleanup to me.

[vsajip]

Needs retargeting for 3.14 but looks like a good cleanup to me.

Agreed.

[felixxm]

Needs retargeting for 3.14 but looks like a good cleanup to me.

Agreed.

Thanks both 👍 Retargeted to Python 3.14.

[felixxm]

Thanks 🎉

[hugovk]

By the way, we also have a dedicated page for deprecations, which is also included in the What's New pages:

https://docs.python.org/3.14/deprecations/index.html

I've added this one to it in #133082.

[felixxm]

By the way, we also have a dedicated page for deprecations, which is also included in the What's New pages:

https://docs.python.org/3.14/deprecations/index.html

I've added this one to it in #133082.

Thanks 👍 I didn't know about this page, noted ✍️