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Pandas DataFrame | isnull method

Pandas
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DataFrame
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Data Indexing and Masks
schedule Jul 1, 2022
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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
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