[Python-Dev] PEP 292, Simpler String Substitutions

[David Abrahams]

From: "Guido van Rossum" <guido@python.org>


> > I love this suggestion. It's the sort of thing you can't do in C++ ;-)
> > I suspect the arguments against will run to efficiency and complexity,
> > since you need to compile the backquoted expressions (in some context).
>
> Actually, I had planned a secret feature that skips matching nested
> {...} inside ${...}, so that you could write a magic dict whose keys
> were eval()'ed in the caller's context.  The %(...) parser does this
> (skipping nested (...)) because someone wanted to do that.

Ooh, magic and secrets! Maybe a little too magical for me to understand
easily. Is the stuff between ${...} allowed to be any valid expression?

harry-potter's-got-nothing-on-you-ly y'rs,
dave