Translations:Expressions/71/en

To reference list objects, the syntax is. If you want for example reference a constraint in a sketch, hover with the mouse over this constraint and look in the footer of FreeCAD's main window. Assuming you see there Sketch_name.Constraint17, then you reference it this way: Sketch_name.Constraints[16] (The index starts with 0, therefore constraint 17 has the index 16.) If you are in the same sketch you can omit its name and just use Constraints[16].