Using a Sizer : Sizer « wxPython « Python Tutorial

1. Python Tutorial
2. wxPython
3. Sizer

import wx

app = wx.App()
win = wx.Frame(None, title="Simple Editor", size=(410, 335))
bkg = wx.Panel(win)

loadButton = wx.Button(bkg, label='Open')
saveButton = wx.Button(bkg, label='Save')
filename = wx.TextCtrl(bkg)
contents = wx.TextCtrl(bkg, style=wx.TE_MULTILINE | wx.HSCROLL)

hbox = wx.BoxSizer()
hbox.Add(filename, proportion=1, flag=wx.EXPAND)
hbox.Add(loadButton, proportion=0, flag=wx.LEFT, border=5)
hbox.Add(saveButton, proportion=0, flag=wx.LEFT, border=5)

vbox = wx.BoxSizer(wx.VERTICAL)
vbox.Add(hbox, proportion=0, flag=wx.EXPAND | wx.ALL, border=5) vbox.Add(contents, proportion=1,
         flag=wx.EXPAND | wx.LEFT | wx.LEFT | wx.LEFT, border=5)

bkg.SetSizer(vbox)
win.Show()

app.MainLoop()