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Provide something like the "Variable explorer" in the Spyder IDE. It essentially is just a list very similar to the say the "Locals" debug window in VS showing all the variables that one defined in the interactive window. In Matlab
the equivalent window is called "Workspace". Having this would make the whole IDE very, very competitive for numerical work.
A simple first version could just have the same features as the "Locals" window. A more advanced version could have nicer features for e.g. numpy arrays, like table editors, plotting etc.