Question

I know that Python, unlike Java, supports inheritance. But does a user class can inherits from several wxPython class without any problem ? (Does the wxPython design allows this ?)

Thank you in advance

I’m coding under Xubuntu 11.04 with wxPython 2.8 binding

P.S : This is my attempt.

#!/usr/bin/python
# -*- coding: iso-8859-15 -*-

import wx

class Square(wx.Panel, wx.Control):

    def __init__(self, parent):
        wx.Panel.__init__(self, parent, wx.ID_ANY, size=(60,60), pos=(80,50))
        wx.Control.__init__(self, parent)
        self.SetBackgroundColour(wx.Colour(0,0,255))

class MainFrame(wx.Frame):

    def __init__(self):
        wx.Frame.__init__(self, None, wx.ID_ANY, "Reactive square application",
            size = (300,200))
        panel = wx.Panel(self, wx.ID_ANY)
        square1 = Square(panel)
        square2 = Square(panel)
        square1.Bind(wx.EVT_BUTTON, self.OnSquareClick)

    def OnSquareClick(self, event):
        dialog = wx.MessageDialog(self, "You clicked on square !!!",
            "Hit has been done", wx.OK)
        dialog.Show(True)


if __name__ == "__main__":
    app = wx.PySimpleApp()
    frame = MainFrame()
    frame.Show(True)
    app.MainLoop()

And this is the stack trace :

swig/python detected a memory leak of type ‘wxControl *’, no destructor found.
Traceback (most recent call last):
File “/home/laurent/Documents/Programmation/Projets/Python/SourcesDeTest/ReactiveSquare.py”, line 31, in
frame = MainFrame()
File “/home/laurent/Documents/Programmation/Projets/Python/SourcesDeTest/ReactiveSquare.py”, line 19, in init
square1 = Square(panel)
File “/home/laurent/Documents/Programmation/Projets/Python/SourcesDeTest/ReactiveSquare.py”, line 10, in init
wx.Control.init(self, parent)
File “/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py”, line 11718, in init
self._setOORInfo(self)
File “/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py”, line 3887, in _setOORInfo
args[0].this.own(False)
File “/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py”, line 14606, in getattr
raise PyDeadObjectError(self.attrStr % self._name)
wx._core.PyDeadObjectError: The C++ part of the Square object has been deleted, attribute access no longer allowed.
Script terminated.

Answer 1

You don’t really want to do multiple inheritance with wxPython classes UNLESS they’re a normal wx class plus a mixin (see g.d.d.c’s answer). Or a wxPython class and a user-defined class. Otherwise, you will probably have issues.