Question

Hello i have created 2 frames, and when I run this program it will show each frame as their own application (at least on windows). Is there a way to use both frames but put them in one application?

import wx

class MainFrame(wx.Frame): 
    def __init__(self): 
        wx.Frame.__init__(self, None, wx.NewId(), "Main") 
        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.button = wx.Button(self, wx.NewId(), "Open a child")
        self.sizer.Add(self.button, proportion=0, border=2, flag=wx.ALL)
        self.SetSizer(self.sizer)
        self.button.Bind(wx.EVT_BUTTON, self.on_button)

        self.Layout()

    def on_button(self, evt):
        frame = ChildFrame(self)
        frame.Show(True)
        frame.MakeModal(True)

class ChildFrame(wx.Frame): 
    def __init__(self, parent): 
        wx.Frame.__init__(self, parent, wx.NewId(), "Child")
        self.Bind(wx.EVT_CLOSE, self.on_close)

    def on_close(self, evt):
        self.MakeModal(False)
        evt.Skip()

class MyApp(wx.App):
    def OnInit(self):
        frame = MainFrame()
        frame.Show(True)
        self.SetTopWindow(frame)
        return True

app = MyApp(0)
app.MainLoop()    

Here is an image of what I do not want:
https://i.stack.imgur.com/7gayc.png

that is what I do not want,
I would like both frames to be in ONE application.

Answer 1

These frames already are running in the same wxPython application (MyApp).
Probably what you mean is to have the two frames/windows in the same wxPython window.

I think this is not possible because wx.Frame class is by definition an independent window.

What you can do very easily is to modify your current classes to derive from wx.Panel instead of from wx.Frame and then put the two panels in the same Common Frame.

For example for the ChildFrame you modify like this:

class ChildPanel(wx.Panel): 
    def __init__(self, parent): 
        wx.Panel.__init__(self, parent, wx.NewId())
    .........................................

Then you create the common Frame and instatiate your panels (and set them in a sizer):

class Common(wx.Frame): 
    def __init__(self, parent): 
        wx.Frame.__init__(self, parent, wx.NewId(), "Common")
        self.Bind(wx.EVT_CLOSE, self.on_close)

        self.child = ChildPanel(self, .....)
        self.main = MainPanel(self, .....)

        ................... 

If as suggested in Inerdial’s comment you are actually looking for MDI windows:

Then you have to use the wx.MDIParentFrame and wx.MDIChildFrame’s classes. For an example, check the MDIDemo.py example in the wxPython docs and demos package. Note that although wxPython supports Multiple Document Inteface windows, Windows has deprecated MDI.