[issue14417] dict RuntimeError workaround

[Guido van Rossum]

Guido van Rossum <guido at 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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<http://bugs.python.org/issue14417>
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