Difference of hash and __hash__()

Re: Difference of hash and __hash__()


"Stefan Fleiter" <stefan.fleiter @web.de> wrote in message
news:bj2nv5$hna [email protected]. ..
[color=blue]
> under Python 2.2.2:
>[color=green][color=darkred]
> >>> s = slice(None,5,No ne)
> >>> hash(s)[/color][/color]
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> TypeError: unhashable type[color=green][color=darkred]
> >>> s.__hash__()[/color][/color]
> 136775584
>
> Can anybody explain this?[/color]

It looks like a bug. Extended slices were added for use by Numerical
Python. It may never have tried to hash them or only done so only
through the C equivavlent of s.__hash__. Extended slicing of
sequences was, I believe, only added in 2.3.

TJR