python how to check nan code example

Example 1: python test is nan

math.isnan(n)

Example 2: check if something is nan python

import math
print math.isnan(float('NaN'))OutputTrue
print math.isnan(1.0)OutputFalse

Example 3: check if value is NaN

Number.isNaN(123)

Example 4: check is string is nan python

>>> pd.isnull(None)
True