Existence from the viewpoint of Python

What is identical to itself exists, otherwise not.

Pythonic Zen:

world = [0, 1, 2, 3, float("nan")]
[x for x in world if x == x]


[0, 1, 2, 3]


According to IEEE754 (or PEP754),

\forall X, NaN != X.

Thus Nan != Nan.

See also

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