python3 is nan
>>> import math
>>> x = float('nan')
>>> math.isnan(x)
True
python3 is nan
>>> import math
>>> x = float('nan')
>>> math.isnan(x)
True
NaN stand for python
not a number
NaN , standing for not a number, is a numeric data type used to represent any value that is undefined or unpresentable. For example, 0/0 is undefined as a real number and is, therefore, represented by NaN.
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