On 30 March 2018 at 20:05, Serhiy Storchaka <storchaka@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 | ncoghlan@gmail.com | Brisbane, Australia