Any built-in ishashable method ?

[Jean-Michel Pichavant]

> So I'm guessing you had a key where
> 
> key1 == key2 did not imply hash(key1) == hash(key2)
> 
> I don't see a way to avoid that problem in a look-before-you-leap
> test.
> 
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> http://mail.python.org/mailman/listinfo/python-list
> 

You guessed right. But it took me a lot of time before jumping to that conclusion, mostly because the code worked in the first place (it can with a little bit of luck).
Now I'm extra careful about what I use as dict key, I was just wondering if there was a reliable quick way to verify an object can be used as key.

That brings me to another question, is there any valid test case where key1 != key2 and hash(key1) == hash(key2) ? Or is it some kind of design flaw ?

JM


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