Ref-strings in logging messages (was: Performance issue with CPython 3.10 + Cython)

[Barry]

> On 7 Oct 2022, at 18:16, MRAB <python at mrabarnett.plus.com> wrote:
> 
> On 2022-10-07 16:45, Skip Montanaro wrote:
>>> On Fri, Oct 7, 2022 at 9:42 AM Andreas Ames <andreas.0815.qwertz at gmail.com>
>>> wrote:
>>> 1. The culprit was me. As lazy as I am, I have used f-strings all over the
>>> place in calls to `logging.logger.debug()` and friends, evaluating all
>>> arguments regardless of whether the logger was enabled or not.
>>> 
>> I thought there was some discussion about whether and how to efficiently
>> admit f-strings to the logging package. I'm guessing that's not gone
>> anywhere (yet).
> Letting you pass in a callable to call might help because that you could use lambda.

Yep, that’s the obvious way to avoid expensive log data generation.
Would need logging module to support that use case.

Barry

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