[Python-Dev] Hashable memoryviews

[Guido van Rossum]

Aren't memoryview objects mutable? I think that the underlying memory
can change, so it shouldn't be hashable.

On Sat, Nov 12, 2011 at 4:23 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:
>
> Hello everyone and Benjamin,
>
> Currently, memoryview objects are unhashable:
>
>>>> hash(memoryview(b""))
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> TypeError: unhashable type: 'memoryview'
>
> Compare with Python 2.7:
>
>>>> hash(buffer(""))
> 0
>
> memoryviews already support equality comparison:
>
>>>> b"" == memoryview(b"")
> True
>
> If the original object providing the buffer is hashable, then it
> seems to make sense for the memoryview object to be hashable. This came
> while porting Twisted to Python 3.
>
> What do you think?
>
> Regards
>
> Antoine.
>
>
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-- 
--Guido van Rossum (python.org/~guido)