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Re: Question about weakref

Frank Millman
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On 05/07/2012 10:46, Dieter Maurer wrote:
> Frank Millman<(E-Mail Removed)> writes:
>> I have a situation where I thought using weakrefs would save me a bit
>> of effort.

> Instead of the low level "weakref", you might use a "WeakKeyDictionary".

Thanks, Dieter. I could do that.

In fact, a WeakSet suits my purposes better. I tested it with my
original example, and it works correctly. It also saves me the step of
deleting the weak reference once the original object is deleted, as it
seems to do that automatically.

I just need to double-check that I would never have the same
listener-object try to register itself with the publisher twice, as that
would obviously fail with a Set, as it would with a Dict.

I would still like to know why weakref.proxy raised an exception. I have
re-read the manual several times, and googled for similar problems, but
am none the wiser. Naturally I feel a bit uneasy using a feature of the
language which sometimes fails mysteriously, so if anyone has an
explanation, I would really appreciate it.


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