Matteo Dell'Amico wrote:
> Paolino wrote:
>
>>I thought rewriting __hash__ should be enough to avoid mutables problem
>>but:
>>
>>class H(set):
>> def __hash__(self)
>> return id(self)
>>
>>s=H()
>>
>>f=set()
>>
>>f.add(s)
>>f.remove(s)
>>
>>the add succeeds
>>the remove fails eventually not calling hash(s).
>
>
> Why don't you just use "frozenset"?
>
This is what I'm doing, but the problem remains IMO.
Anyway with frozenset I have to override __new__ instead of __init__ to
make the initialization which is an operation not described in the
frozenset docs, which makes subclassing frozenset a different operation.
Thanks Paolino
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