frozendict

Steven D'Aprano steve+comp.lang.python at pearwood.info
Fri Feb 10 02:24:57 CET 2012


On Thu, 09 Feb 2012 09:35:52 -0700, Ian Kelly wrote:

> On Thu, Feb 9, 2012 at 8:19 AM, Nathan Rice
> <nathan.alexander.rice at gmail.com> wrote:
>> As I said, two dictionaries created from the same input will be the
>> same...
> 
> That's an implementation detail, not a guarantee.  It will hold for
> current versions of CPython but not necessarily for other Python
> implementations.

That day may be sooner than you think. It is very likely that in Python 
3.3, dict order will be randomized on creation as a side-effect of adding 
a random salt to hashes to prevent a serious vulnerability in dicts.

http://securitytracker.com/id/1026478

http://bugs.python.org/issue13703


If there is anyone still assuming that dicts have a predictable order, 
they're going to be in for a nasty surprise one of these days.



-- 
Steven



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