Eric Smith wrote: > Martin v. Löwis wrote: >> Steven Bethard wrote: >>> There's a lot of code already out there (in the standard library and >>> other places) that uses %-style formatting, when in Python 3.0 we >>> should be encouraging {}-style formatting. >> >> I don't agree that we should do that. I see nothing wrong with using >> % substitution.
I agree with Martin. Both approaches have their ups and downs, but forcing users to move from %-formatting to .format()-formatting will just frustrate them: having to convert several thousand such (working) uses in their code with absolutely no benefit simply doesn't look like a good way to spend your time. In addition to the code changes, such a move would also render existing translations of the %-formatted string templates useless. > It's a maintenance burden. There are several outstanding bugs with it, > admittedly not of any great significance. I've been putting time into > fixing at least one of them. When Mark and I did short-float-repr, at > least half of my time was consumed with %-formatting, mostly because of > how it does memory management. Why not allow both and use .format() for those cases where %-formatting doesn't work too well ? > On the plus side, %-formatting is (and always will be) faster than > str.format(). Its very limitations make it possible for it to be fast. > > I'd note that PEP 3101 calls str.format() a replacement for > %-formatting, not an alternate mechanism to achieve the same end. I think that's a wording we should change. -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Source (#1, Oct 01 2009) >>> Python/Zope Consulting and Support ... http://www.egenix.com/ >>> mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ ________________________________________________________________________ ::: Try our new mxODBC.Connect Python Database Interface for free ! :::: eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 http://www.egenix.com/company/contact/ _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com