Hi, Mike, On Sep 9, 2008, at 9:34 PM, Mike Hansen wrote:
>> What's the difference between "==" and "is" (or, more to the point: >> where is this discussed)? > > This is a Python thing as "==" is equality testing and "is" is memory > address testing. For example, > > sage: a = 2 > sage: b = 2 > sage: a == b > True > sage: id(a) > 54737440 > sage: id(b) > 54735856 > sage: a is b > False > > In Python, None, True, and False are all unique so you should use "is" > with them since it is just a pointer check. I think I actually once knew this. I hope that is the case again soon. Thanks for the clarification. Justin -- Justin C. Walker, Curmudgeon-at-Large () The ASCII Ribbon Campaign /\ Help Cure HTML Email --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
