[Python-Dev] Hashable memoryviews

[Antoine Pitrou]

Thinking of it, an alternative would be to implement lazy slices of
bytes objects (Twisted uses buffer() for zero-copy slices).

Regards

Antoine.


On Sun, 13 Nov 2011 01:23:59 +0100
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.
> 
>