On Tue, Oct 8, 2013 at 5:11 PM, Antoine Pitrou <report@bugs.python.org>wrote:

>
> Antoine Pitrou added the comment:
>
> > > > Punting this to 3.5 basically means we'll have to either wait for
> > > > 3.5, or do something awful like use cffi to grab sprintf to port
> > > > Mercurial.
> > >
> > > Or write a pure Python implementation.
> >
> > Hah. Probably too slow for anything beyond a proof of concept, no?
>
> If it's only for the Mercurial test suite, that shouldn't be a problem?

It's not just the testsuite though: we do this _all over_ hg itself. For
example, status needs to do something like this:

sys.stdout.write('%(state)s %(path)s\n' % {'state': 'M', 'path':
'some/filesystem/path'})

except we don't know the encoding of the filesystem path (Hi unix!) so we
have to treat the whole thing as opaque bytes. It's even more fun for
'log', becase then it's got localized strings in it as well.