[issue10356] decimal.py: hash of -1
Stefan Krah
report at bugs.python.org
Fri Nov 19 00:02:35 CET 2010
Stefan Krah <stefan-usenet at bytereef.org> added the comment:
Raymond Hettinger <report at bugs.python.org> wrote:
> The choice between ValueError and TypeError can sometimes be ambiguous and seem arbitrary and I understand why you're gravitating towards ValueError (because it works some values and not others), but in this case the API is already fixed by what hash() does elsewhere.
>
> It is no fair to users to have to wrap hash(x) calls with a try/except that catches both exceptions. So, we should still to a consistent hash API:
>
> >>> hash([])
> Traceback (most recent call last):
> File "<pyshell#1>", line 1, in <module>
> hash([])
> TypeError: unhashable type: 'list'
>
> In this case, practicality beats purity and released beats unreleased.
Ok, this makes sense. I can revert the commit unless you prefer to handle
it yourself.
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