python check for nan code example

Example 1: python test is nan

math.isnan(n)

Example 2: python3 is nan

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

Example 3: check if something is nan python

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

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

Example 5: Identify Null and NAN python

import pandas as pd
pd.isnull(df.columnName).sum()
pd.notnull(df.columnName).sum()

Example 6: how to check if a string value is nan in python

if(term != term):
	print("it's a nan value")