On Wed, Apr 9, 2008 at 10:18 PM, Carl Witty <[EMAIL PROTECTED]> wrote: > > I'd like to reopen discussion of #2781, "bool() for SymbolicEquation > should raise an error when it doesn't know the answer". Jason created > a prototype patch to implement this, but gave up on it and closed the > ticket when he was convinced that "this is not pythonic". > > I like the "raise an exception" behavior, because it would eliminate > questions asking why form1 and form2 below are different (from this > sage-support thread > http://groups.google.com/group/sage-support/browse_thread/thread/79d0d6d94cfe9526#). > (I have seen this exact problem at least twice on sage-support.) What > do you think?
-1 I like bool(x>0) to be False by default if the answer is not known. mhansen raised this great point that we rely so much on things like : if (condition on x): do something that it would be cumbersome to surround this statement with a try,catch block. I'm only opposing this because it is unpythonic but I don't see any reason not to define methods that have the same functionality for SymbolicEquation but *can* raise an exception when appropriate. didier --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
