Guido van Rossum <gu...@python.org> added the comment:

But the sleep(0.1) forces a thread switch so I consider that still cheating -- 
nobody in their right mind would consider calling sleep() inside __hash__.

You can probably get it to fail without this by just doing a bunch of random 
computation in the __hash__ (and using a low sys.setswitchinterval() value).  
Or consider creating a key that consists of e.g. a tuple of 100 or 1000 Key 
instances -- hashing that will call the __hash__ on each of those, wasting a 
lot of cycles.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14417>
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