python dataframe check if nan code example

Example 1: check if a value in dataframe is nan

#return a subset of the dataframe where the column name value == NaN 
df.loc[df['column name'].isnull() == True]

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

> df.isnull().any().any()
True

Example 3: to detect if a data frame has nan values

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