user interface - Python attempting to create a simple gui, getting "AttributeError: 'MainMenu' object has no attribute 'intro_screen'" -

complete newbie here python started learning language few days ago (with no programming experience beforehand).

i'm bashing skull against desk here, trying create 1 menu button lead menu, supposed replace/hide/destroy previous menu (either works, long process can reversed).

what i've come far:

import wx   class mainframe(wx.frame):      def __init__(self):         wx.frame.__init__(self, none)          self.centre()         self.main_menu = mainmenu(self)         self.intro_screen = introscreen(self)         self.intro_screen.hide()   class mainmenu(wx.frame):      def __init__(self, parent):         wx.frame.__init__(self, parent=parent)          self.main_menu = mainmenu         panel = wx.panel(self)         sizer = wx.boxsizer(wx.vertical)          nextscreen = wx.button(panel, label='next screen', size=(150,30))         nextscreen.bind(wx.evt_button, self.nextscreen)         sizer.add(nextscreen, 0, wx.center|wx.all, 5)          self.show()         self.centre()      def nextscreen(self, event):          self.main_menu.hide(self)         self.intro_screen.show()   class introscreen(wx.frame):      def __init__(self, parent):         wx.frame.__init__(self, parent=parent)          self.intro_screen = introscreen         panel = wx.panel(self)         sizer = wx.boxsizer(wx.vertical)          gobackscreen = wx.button(panel, label='go screen', size=(150,30))         gobackscreen.bind(wx.evt_button, self.gobackscreen)         sizer.add(gobackscreen, 0, wx.center|wx.all, 5)          self.show()         self.centre()      def gobackscreen(self, event):          self.intro_screen.hide()                 self.main_menu.show()   if __name__ == "__main__":     app = wx.app(false)     frame = mainframe()     #frame.show()     app.mainloop() 

from can tell, nextscreen button not see intro_screen class, , therefore unable show it. clueless how fix this.

indeed, have absolutely no idea if on right way it. appreciated

using python 2.7

intro_screen attribute of mainframe instances; not of mainmenu instances.

your mainmenu.__init__() method passed in mainframe instance parent. not if self.parent set line wx.frame.__init__(self, parent=parent), if not, add self.parent = parent in mainmenu.__init__(.

you can refer self.parent on mainmenu instances, , following should work:

self.parent.intro_screen.show() 

i not sure why setting current class instance attribute:

self.main_menu = mainmenu 

and

self.intro_screen = introscreen 

instead of self.main_menu.hide(self) can call self.hide(), reference class not needed.