python and pandas value Nan check code example

Example 1: find nan value in dataframe python

# to mark NaN column as True
df['your column name'].isnull()

Example 2: to detect if a data frame has nan values

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

Example 3: check if something is nan python

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