In each of the scripts below, it is assumed that the MyVis variable references the targeted visualization. See here for more information about referencing visualizations.
Change the Treemap Size by Custom Expression
from Spotfire.Dxp.Application.Visuals import *
myVis = myVis.As[Visualization]()
myVis.SizeAxis.Expression = "Sum([Column 1])"
If you aren't sure how to write a specific custom expression correctly from scratch, start by building the expression interactively using the Spotfire user interface. Once your custom expression is working correctly, right-click on the custom expression input box selector(s) and choose Custom Expression. You can then copy the expression shown into your IronPython script.
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