PandasdrillRename columns and replace a placeholder
A pandas exercise from Pandasdrill. Solve it with a Python editor in your browser running real pandas, and it is checked the moment you submit.
The task
Rename the columns `Qty` to `qty`, `Unit Price` to `unit_price` and `Region` to `region`. Then replace the text "N/A" in the region column with "Unknown". Return the table.
What this exercise teaches
rename takes a dict from old to new names and leaves other columns alone. replace on the region column then swaps the placeholder text for a real label, so later groupings do not treat "N/A" as a region.
A hint if you get stuck
rename(columns={old: new}) changes labels, and Series.replace(old, new) swaps values.
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