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3. How would you add a new column namely 'val' to a dataframe df that has 10 rows in it and has columns as 'Item', 'Qty', 'Price' ? You can choose to
![Feature request] Insert a column with constant value · Issue #1019 · vaexio/vaex · GitHub](https://user-images.githubusercontent.com/7196876/96822228-c717d100-1453-11eb-9a50-d530854a67ee.png "Feature request] Insert a column with constant value · Issue #1019 · vaexio/vaex · GitHub")