is not nan python 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: numpy is not nan

a = a[~np.isnan(a)]

Example 4: check is string is nan python

>>> pd.isnull(None)
True