This isn't really a "how do I find this constant" question though.
This is an API question, and you can find the answers you're looking
for in the wxWidgets docs, which lists the constants that any
particular call will take.
Ah. That is a source I hadn't looked at yet.
Are all constants named the same in wxPython as they are in wxWidgets
(wxLIST_AUTOSIZE becoming wx.LIST_AUTOSIZE of course)?