My advice: stick to what you already know!
A tiny, gentle (although, when I last checked, not entirely "bug-free")
introduction to Python and XSI/Softimage can be found in this pdf.
And strictly speaking, the line "Application.SelectObj("leaveme.Polygon*.pnt[0,4,9,58,69]" obviously is scripting code/syntax. You could however copy the string "leaveme.Polygon*.pnt[0,4,9,58,69]" and paste this into the "Object Selection Text Box" in the "Select Panel" to achieve the same effect... ;)
