frozendict
Steven D'Aprano
steve+comp.lang.python at pearwood.info
Thu Feb 9 20:24:57 EST 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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