Inheritance diagram for wx.PyCommandEvent:
wx.PyCommandEvent can be used as a base class for implementing custom event types in Python, where the event shoudl travel up to parent windows looking for a handler. You should derived from this class instead of wx.CommandEvent because this class is Python-aware and is able to transport its Python bits safely through the wxWidgets event system and have them still be there when the event handler is invoked.
See also
