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From: Serhiy Storchaka <storchaka@gmail.com>
Subject: Re: set and dict iteration
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On 27.08.12 22:17, Ian Kelly wrote:
> May I
> suggest an alternate approach?  Internally tag each set or dict with a
> "version", which is just a C int.  Every time the hash table is
> modified, increment the version.  When an iterator is created, store
> the current version on the iterator.  When the iterator is advanced,
> check that the iterator version matches the dict/set version.  If
> they're not equal, raise an error.

Oh, I'm surprised that this strategy is not used yet. I was sure that it 
is used.