Marko Rauhamaa wrote:
id() is actually an ideal return value of __hash__(). The only criterion
is that the returned number should be different if the __eq__() is
False. That is definitely true for id().


$ python
Python 2.7.13 (default, Jan 19 2017, 14:48:08)
[GCC 6.3.0 20170118] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> nan = float('NaN')
>>> id(nan) == id(nan)
True
>>> nan == nan
False
>>>
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