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Task: Pandas DataFrame fillna() for Selected Columns Only

Task: Pandas DataFrame fillna() for Selected Columns Only: a task in Terminal-Lego-15k (Harbor dataset). You need to fill None / NaN values in a Pandas DataFrame with 0 's, but only for a specific subset of columns, leaving other columns unchanged.

The task

You need to fill `None`/`NaN` values in a Pandas DataFrame with `0`'s, but only for a specific subset of columns, leaving other columns unchanged.

Part of PrimeIntellect/Terminal-Lego-15k.