[issue43695] Improve `=` in f-strings

[Serhiy Storchaka]

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

I think it goes too far. It was initially designed as a simple for implementation and use feature which covers a large amount of use cases of using f-strings for debugging. You propose to add syntactically a new postfix operator which is valid only in "="-substisutions in f-strings, with complex semantic. It would be difficult to implement, and it would significantly complicate Python grammar. Also it will prevent using ? for other purposes in Python expressions in future.

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nosy: +serhiy.storchaka

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