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How to check for NaN values

Submitted by: @import:stackoverflow-api·Mar 10, 2026·

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howvaluescheckfornan

Problem

float('nan') represents NaN (not a number). But how do I check for it?

Use math.isnan:

>>> import math
>>> x = float('nan')
>>> math.isnan(x)
True

>>> import math
>>> x = float('nan')
>>> math.isnan(x)
True

Stack Overflow Q#944700, score: 2210

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