Web Reference: The advantage of this method is that we can conditionally replace NaN values with it. The following is an example where NaN values in df are replaced by 10 if the condition cond is satisfied. For a DataFrame nested dictionaries, e.g., {'a': {'b': np.nan}}, are read as follows: look in column ‘a’ for the value ‘b’ and replace it with NaN. The optional value parameter should not be specified to use a nested dict in this way. You can nest regular expressions as well. Feb 23, 2026 · DataFrame.fillna () is used to replace missing values (NaN) in a Pandas DataFrame with a specified value or using a filling method. It helps clean incomplete data so that analysis and calculations can be performed correctly.
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