Jeff Shannon wrote:

> So show us a dictionary (i.e. hash table) implementation that can do this.  
> You'll need to be able 
> to derive the old hash from the new hash, of course, so that you can 
> correctly associate the 
> values already stored under that key.  And you'll have to be able to do that 
> without referring to 
> the pre-modified object again, because dicts can't track every Python 
> operation that might modify 
> a key object.  And it needs to deal properly with equivalent-but-different-ID 
> list literals, 
> because using literals (and not references stored elsewhere) is an important 
> and common dict key 
> usage.

and to temporarily refer back to the top of this thread, do all this without
any performance impact, compared to the current implementation.

</F> 



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