wxPython and multiple inheritance

I know that Python, unlike Java, supports inheritance. But does a user class can inherits from several wxPython class without any problem ? (Do开发者_Python百科es 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.

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.

Inheritance from multiple parent classes is definitely possible, yes.

http://docs.python.org/tutorial/classes.html#multiple-inheritance

I don't seem to run into any trouble using multiple base classes, wx classes included:

class VirtualList(ListCtrl):
  def __init__(self,
               parent,
               colref = None,
               style = LC_REPORT | LC_VIRTUAL | LC_HRULES | LC_VRULES):

    ListCtrl.__init__(self, parent, style = style)

class TransformList(VirtualList, CheckListCtrlMixin):
  def __init__(self, parent, refid):
    VirtualList.__init__(self, parent, colref = 'transform_columns')

    CheckListCtrlMixin.__init__(self)

    # This facilitates drag / drop re-ordering.
    self.Bind(wx.EVT_LIST_BEGIN_DRAG, self._startDrag)

    dt = ListDrop(self._reorder)

    self.SetDropTarget(dt)

It is my experience that wxPython does not encourage multiple inheritance of wxPython classes.

Doing something like this will either cause errors or unexpected consequences with your new class:

class MyControl(wxButton, wxComboBox):
    pass

However, you can use multiple inheritence to inherit a wxPython class and your own class in order to extend it in a more OO kind of way.

 class ControlActions(object):
     def MoveHere(self):
          pass

 class MyControl(wxButton, DoActions):
     pass