[Python-3000] String formatting: Conversion specifiers

[Michael Chermside]

Talin writes:
> So I decided to sit down and rethink the whole conversion specifier
> system.

+1: good idea!

Nick Coghlan writes:
> Generally nice, but I'd format the writeup a bit differently (see below) and
> reorder the elements so that an arbitrary character can be supplied as the
> fill character and the old ' ' sign flag behaviour remains available.

+1: nice tweak

-- Michael Chermside