[pypy-dev] Ordered dict in PyPy

[Maciej Fijalkowski]

btw, I'm also ok with reversed being implemented by simply making a copy

On Sun, Jan 11, 2015 at 9:37 PM, Maciej Fijalkowski <fijall at gmail.com> wrote:
> I'm with Alex on that - raising RuntimeError is a good behavior when
> "you're not supposed to do that" happens. I would go with 1) as
> opposed to 2)
>
> On Sun, Jan 11, 2015 at 9:26 PM, Alex Gaynor <alex.gaynor at gmail.com> wrote:
>> IMO, it's clear that CPython intends this to be "undefined behavior",
>> raising a RuntimeError is a perfectly acceptable undefined behavior IMO --
>> better than corrupting the data.
>>
>> For __eq__ and __reversed__ and popitem(last=False) we can just have
>> functions in __pypy__ and call them from class OrderedDict(dict): in
>> collections I think?
>>
>> Alex
>>
>>
>> On Sun Jan 11 2015 at 11:20:55 AM Armin Rigo <arigo at tunes.org> wrote:
>>>
>>> Hi Laura,
>>>
>>> On 11 January 2015 at 19:57, Laura Creighton <lac at openend.se> wrote:
>>> > Can we talk the CPython developers into raising RunTimeError for
>>> > concurrent modifications?
>>>
>>> No, we can't expect them to change that:
>>> http://bugs.python.org/issue19414 shows they have no plan to have
>>> well-defined behavior (either RuntimeError or well-defined results).
>>>
>>> So for us, the question is if it makes sense for us to break
>>> compatibility with CPython 2.7 in this undocumented aspect by arguing
>>> that CPython's sometimes bogus results shows it was never meant to
>>> work at all (which is true), or if instead we should go the opposite
>>> way and offer some well-defined results that generalizes the partially
>>> working results of CPython (which would make people happy but is
>>> harder to implement).
>>>
>>> Note that I would be fine if we can't find any existing program that
>>> relies on this.  Then we can decide to implement the RuntimeError
>>> solution.  If and when somebody files a PyPy bug report, we can argue
>>> again.
>>>
>>>
>>> A bientôt,
>>>
>>> Armin.
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>>
>>
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