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You can add a new column by:

Clicking on the blue "+" button
Selecting "Add New Column" in the drop-down list of the first field
Typing in the name of the new column
Selecting the attribute type
Typing in an expression using the Python syntax

You can modify an existing column by:

Clicking on the blue "+" button
Selecting one existing column in the drop-down list of the first field
Selecting the attribute type
Typing in an expression using the Python syntax

You can get the value of any existing attribute in the expression by:

Typing in tuple_["$attributeName"] in the expression field
Replacing $attributeName with the attributeName you want to access

Example: Add a new column called IsExpensive where the value is True if the unit price is greater than 500
Operations:

Clicking on the blue "+" button
Selecting "Add New Column" in the drop-down list of the first field
Typing in the name of the new column as IsExpensive
Selecting the attribute type as boolean
Typing in the expression as True if tuple_["Unit Price"] > 500 else False

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