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. Jul 15, 2025 · In Python, there are two methods by which we can replace NaN values with zeros in Pandas dataframe. They are as follows: The fillna () function is used to fill NA/NaN values using the specified method. Let us see a few examples for a better understanding. Replace NaN values with zeros for a column using Pandas fillna () 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.
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