On 30 March 2018 at 20:05, Serhiy Storchaka <storch...@gmail.com> wrote: > 30.03.18 02:16, Steven D'Aprano пише: >> >> Is there a down-side to 2b? It sounds like something you might end up >> doing at a later date regardless of what you do now. > > > This complicate the compiler and the eval loop, especially in the case of > nested substitutions in formats, like > > f'{value:+{width:d}.{prec:d}f}'
This point reminded me that there's still https://www.python.org/dev/peps/pep-0536/ to consider as well (that's the PEP about migrating f-strings to a fully nested expression grammar rather than hijacking the existing string tokenisation code). I *think* that's an orthogonal concern (since it relates to the initial parsing and AST compilation phase, rather then the code generation and execution phase), but it's worth keeping in mind. Cheers, Nick. -- Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com