python check if value is null or nan code example

Example 1: to detect if a data frame has nan values

df.isnull().sum().sum()
5

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: python checking if something is equal to NaN

# Test to see if it is equal to itself
def isNaN(num):
    return num != num