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How to add new columns to Pandas dataframe?
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![Adding columns through enlargement - Learning pandas - Second Edition [Book]](https://www.oreilly.com/api/v2/epubs/9781787123137/files/assets/afb9d429-c0cf-4a25-bbb4-bced6421e59e.png "Adding columns through enlargement - Learning pandas - Second Edition [Book]")
Adding columns through enlargement - Learning pandas - Second Edition [Book]
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