[issue38693] Use f-strings instead of str.format within importlib

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I just have merged a change which makes many C-style formatting as fast as f-strings (issue28307) and am working on supporting more format codes (%d, %x, %f, etc). Using C-style formatting can be a good option if you want performance and backward compatibility. It was faster than str.format() even without that optimization.

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nosy: +serhiy.storchaka

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