8000 All NaNs are unequal, but some are more unequal than others · Issue #22 · cosmologicon/pywat · GitHub
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All NaNs are unequal, but some are more unequal than others #22

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cdyson37 opened this issue Nov 3, 2015 · 2 comments
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All NaNs are unequal, but some are more unequal than others #22

cdyson37 opened this issue Nov 3, 2015 · 2 comments

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@cdyson37
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cdyson37 commented Nov 3, 2015

Suggestion for a wat:

nan = float("nan")
print (nan == nan)                      # False
print ({1 : nan} == {1 : nan})          # True
print ({1 : nan} == {1 : float("nan")}) # False
@cosmologicon
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That's great. Looks like it works for lists too. I added it to the section on NaN-related wats. Thanks!

@cdyson37
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cdyson37 commented Nov 6, 2015

I love it! Could possibly provide a hint as to why we have this behaviour by pointing out that "x is x" but "x != x" (and it's the internal assumption that the former implies the latter that's the problem). But that might detract from the beauty of the wat :)
EDIT: You did that already in explanation.md - ignore me!

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