I've always thought that in cpython hash() built-in function returns the integer itself for integers. So I was a bit confused, when I found out, that hash(-1) is an exception to the rule and returns -2.
Is there any reason for hash(-1) to not be equal -1
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Kirill Zaitsev
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tldr: because `-1` is used to signal errors in underlying C function. full version: http://effbot.org/zone/python-hash.htm – Cong Ma Oct 13 '15 at 17:23
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Possible duplicate of http://stackoverflow.com/questions/10130454/why-do-1-and-2-both-hash-to-2-in-python – Ahsanul Haque Oct 13 '15 at 17:24