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Wed Feb 17 09:05:24 EST 2016 · https://mail.python.org/pipermail/python-dev/2016-February/143382.html

On 02/17/2016 08:49 AM, Chris Angelico wrote:
> On Thu, Feb 18, 2016 at 12:29 AM, Larry Hastings <larry at hastings.org> wrote:
>> int objects have their own hash algorithm, built in to long_hash() in
>> Objects/longobject.c.  The hash of an int is the value of the int, unless
>> it's -1 or doesn't fit into the native type.
> Can someone elaborate on this special case, please? I can see the code
> there, but there's no comment. Is there some value in not hashing to
> -1?

Returning -1 indicates an error / exception.  So hash functions never 
return -1 as a hash value.

//arry/
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[Python-Dev] Hash randomization for which types?