Note: this suggestion should echo https://mail.python.org/archives/list/python-ideas@python.org/thread/UUFFAI3FZMQRVPDCUPZEOAZCRNXKWFDE/ but has a bigger scope and completely differs in the way to proceed.
Currently, Python lacks a way to integrate code parts into string; when I say code, I don't talk only about identifiers (on which is focusing `nameof` suggestion) but also about expression. Actually, this feature exists in Python but is hidden in a 3.8 [f-string feature](https://docs.python.org/3.8/whatsnew/3.8.html#f-strings-support-for-self-documenting-expressions-and-debugging). Expression string should be made accessible for itself. It could be done by adding a leading token `:` to the expression. Thus `f"{:a + b}" == "a + b"`. Like "normal" formatted expression, it would be handled by IDEs, especially for refactoring. The difference with "normal" formatted expression is that the expression would not be evaluated. A use case example: ```python def foo(bar: int): if bar != 42: # If `bar` is renamed, error message will be renamed too by the IDE raise ValueError(f"{:bar} is not 42") ``` By the way, there will be the following equivalence: `f"{a + b=}" == f"{:a + b}={a + b}"`. The idea is to reuse existing mechanisms. (Of course the syntax suggestion is arbitrary and can be discussed. I have considered a leading token because there are already a lot of modifiers at the end of the expression; I have thought about `:` and `!` and my preferences has gone to `:`.) Joseph _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/7VAII3CWQ7TCINRIMLYVZXN36S7Z3RZB/ Code of Conduct: http://python.org/psf/codeofconduct/
