[Python-Dev] transitioning from % to {} formatting

Vinay Sajip vinay_sajip at yahoo.co.uk
Sun Oct 4 00:29:34 CEST 2009

Nick Coghlan <ncoghlan <at> gmail.com> writes:

> I'm starting to think that a converter between the two format
> mini-languages may be the way to go though.
> fmt_braces is meant to provide a superset of the capabilites of
> fmt_percent, so a forward converter shouldn't be too hard. A reverse
> converter may have to punt with ValueError when it finds things that
> cannot be expressed in the fmt_percent mini language though.

I've done a first cut of a forward (% -> {}) converter:


but I'm not sure there's a case for a converter in the reverse direction, if
we're encouraging movement in one particular direction.


Vinay Sajip

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