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chevron_leftData Indexing and Masks

Method all Method any Method isin Method isna Method isnull Method mask Method notna Method where Property at Property iat Property iloc Property loc

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Pandas DataFrame | isnull method

schedule Aug 11, 2023

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Python●Pandas

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Parameters Return value Examples

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Pandas DataFrame.isnull(~) method returns a boolean mask where True is set for missing values (NaNs) and False for the rest.

NOTE

This method is equivalent to DataFrame.isna().

Parameters

The method does not take any parameter.

Return value

A boolean mask where True is set for missing values (NaN) with False for the rest.

Examples

Consider the following DataFrame:


        
        
            
                
                
                    df = pd.DataFrame({"A":[np.NaN,2], "B":[3,np.NaN]})
df
                
            
               A    B
0  NaN  3.0
1  2.0  NaN

To check for missing values:


        
        
            
                
                
                    df.isnull()
                
            
               A      B
0  True   False
1  False  True

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Published by Isshin Inada

Edited by 0 others

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Official Pandas Documentation

https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.isnull.html#pandas.DataFrame.isnull

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