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Calculations on particular columns in a table created using dash-table-experiments

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I am trying to perform subtraction of column ‘def’ (should be interactive) and column ‘abc’ and want to store the result in column ‘xyz’. I am using callbacks but not getting exactly how to read input from single column (def) in a table and after performing some calculations, how to write the result into the same table’s column (xyz). Data is stored in csv currently.

See [Solved] Updating a Dash Datatable rows with row_update and rows