How to delete everything on PCB board in python?

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I have written a python script to generate a board containing a variable number of submodules in a grid. It works just fine.

However, I would like to automatically delete the previously generated version. That is, I am trying to iteratively create a size X board, then a size X+n board, and so on. However, I can’t figure out how to delete everything on the size X board before proceeding to the size X+n board.

I thought that

pcbnew.GetBoard().ClearProject()

seemed like what I wanted but once I do pcbnew.Refresh() kicad just crashes. Can anyone clue me in on the correct way to do this?

Thanks much!