On Jan 27, 2008 8:16 PM, Nick Coghlan <[EMAIL PROTECTED]> wrote: > eric.smith wrote: > > Author: eric.smith > > Date: Sun Jan 27 22:07:59 2008 > > New Revision: 60376 > > > > Modified: > > python/branches/py3k/Lib/test/test_float.py > > python/branches/py3k/Lib/test/test_long.py > > python/branches/py3k/Objects/stringlib/formatter.h > > Log: > > Restrict format presentation types to those specified in the 'Standard > > Format Specifiers' section of PEP 3101. > > I think this checkin goes too far in removing support for the floating > point formatting codes from integers. Guido objected to %d working on > floats last year, but expected %f and friends to continue to work on > integers [1]. This makes sense when you consider that there is no data > loss in displaying an integer as a floating point number, while there is > a definite potential for data loss when going the other way. > > Perhaps the PEP needs a tweak (referencing Guido's email) to state > explicitly that the builtin integers understand the floating point > formatting codes, but the builtin and standard library floating point > types don't understand the integer codes? That area of the PEP is > slightly problematic anyway where it suggests that integers could handle > the floating point codes by delegating to float() - that isn't quite > true, since the maximum precision on floats is less than the maximum > precision on integers. > > Cheers, > Nick. > > [1] > http://mail.python.org/pipermail/python-3000/2007-August/009066.html
Agreed with Nick -- in general, the idea is that ints should be allowed whenever floats are expected -- just not the other way around! Python 2.x broke this in one important place, division -- 2/3 and 2.0/3.0 had different meanings there. We are fixing this in 3.0. Please maintain this rule for formatting! -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-3000-checkins mailing list Python-3000-checkins@python.org http://mail.python.org/mailman/listinfo/python-3000-checkins
