En Wed, 27 Feb 2008 00:39:09 -0200, Mark Dickinson <[EMAIL PROTECTED]> escribió: > On Feb 26, 9:00 pm, Paul Rubin <http://[EMAIL PROTECTED]> wrote: >> Certainly, I'd expect that if x and y are both integers and x is an >> exact multiple of y, then x/y will be computable and not overflow. >> But try computing 10**5000 / 10**4000 under future division (that is >> supposed to give a float). > > And smaller numbers are problematic too: > >>>> from __future__ import division >>>> 10**50/10**40 > 10000000000.0 >>>> 10**60/10**50 > 9999999999.9999981 > > This despite the fact that the quotient *is* exactly representable > as a float...
But: py> 10**60//10**50 10000000000L Nobody has menctioned yet the -Q command line option: -Qwarn will issue a warning when 3/4 is executed. And there is a helper script, Tools\scripts\fixdiv.py, that helps on locating and replacing / operators. It works by analyzing the warnings issued when the target program is actually executed with -Qwarnall. There is also a companion script, finddiv.py, that just scans the source looking for / and /= operators. They exist since this semantic change was introduced *seven* *years* ago, in 2001, so it's not that suddenly the Python world is going to be upside down... I can't believe how long this thread is by now... -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
