Chris Rebert <c...@rebertia.com> writes:
> On Thu, Oct 7, 2010 at 1:46 PM, Arnaud Delobelle <arno...@gmail.com> wrote:
[...]
>> I think defining mutability is subject to opinion, but here is a first
>> approximation.
>>
>>
>> def mutable(obj):
>> return obj.__hash__ is None or type(obj).__hash__ == object.__hash__
>
> Corner case (I think):
>>>> a = object()
>>>> a.b = "c"
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> AttributeError: 'object' object has no attribute 'b'
>>>> mutable(a)
> True
Ah true. There was also the problem that e.g. mutable(tuple) was False.
How about this second approximation:
def mutable(obj):
h = type(obj).__hash__
return not h or h is object.__hash__ and type(obj) is not object
--
Arnaud
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