[Python-Dev] Fighting the theoretical randomness of "is" on immutables

Nick Coghlan ncoghlan at gmail.com
Mon May 6 16:20:56 CEST 2013

On Mon, May 6, 2013 at 11:26 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:
> Le Mon, 6 May 2013 23:18:54 +1000,
> Nick Coghlan <ncoghlan at gmail.com> a écrit :
>> We're not going to change the language design because people don't
>> understand the difference between "is" and "==" and then wrongly blame
>> PyPy for breaking their code.
> Well, if I'm doing:
>   mylist = [x]
> and ``mylist[0] is x`` returns False, then I pretty much consider the
> Python implementation to be broken, not my code :-)

Yeah, that's a rather good point - I briefly forgot that the trigger
here was PyPy's specialised single type containers.


Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

More information about the Python-Dev mailing list