In case you need it, there's a .py file containing a class to dump the contents of wx.Grid and wx.ListCtrl to an excel file.
Feel free to use it.
An app using the class is also available .
It needs pyXLWriter
The URL of the class and the demo app is http://www.smartics.biz/site/descargas/index_html
All messages and texts are in spanish but I'am sure you can find the way to localize it.