ListBox MultiWindow TkInter Example

gui.py

import Tkinter as tk

class Page(tk.Frame):
    def __init__(self, *args, **kwargs):
        tk.Frame.__init__(self, *args, **kwargs)
    def show(self):
        self.lift()

class Page1(Page):
   def __init__(self, *args, **kwargs):
       Page.__init__(self, *args, **kwargs)
       label = tk.Label(self, text="This is page 1")
       label.pack(side="top", fill="both", expand=True)

class Page2(Page):
   def __init__(self, *args, **kwargs):
       Page.__init__(self, *args, **kwargs)
       label = tk.Label(self, text="This is page 2")
       label.pack(side="top", fill="both", expand=True)

class Page3(Page):
   def __init__(self, *args, **kwargs):
       Page.__init__(self, *args, **kwargs)
       label = tk.Label(self, text="This is page 3")
       label.pack(side="top", fill="both", expand=True)

def pageselect(pages, event):
  widget = event.widget
  index = int(widget.curselection()[0])
  pages[index].show()

class MainView(tk.Frame):
    def __init__(self, *args, **kwargs):
        tk.Frame.__init__(self, *args, **kwargs)
        p1 = Page1(self, borderwidth=2, highlightbackground="black")
        p2 = Page2(self, borderwidth=2, highlightbackground="black")
        p3 = Page3(self, borderwidth=2, highlightbackground="black")
        pages = [p1, p2, p3]
        selection_frame = tk.Frame(self)
        message_frame = tk.Frame(self)
        selection_frame.pack(side="left", fill="both", expand=False)
        message_frame.pack(side="left", fill="both", expand=True)

        p1.place(in_=message_frame, x=0, y=0, relwidth=1, relheight=1)
        p2.place(in_=message_frame, x=0, y=0, relwidth=1, relheight=1)
        p3.place(in_=message_frame, x=0, y=0, relwidth=1, relheight=1)

        # b1 = tk.Button(buttonframe, text="Page 1", command=p1.lift)
        # b2 = tk.Button(buttonframe, text="Page 2", command=p2.lift)
        # b3 = tk.Button(buttonframe, text="Page 3", command=p3.lift)

        selection_listbox = tk.Listbox(selection_frame)
        selection_listbox.insert(1, "Page 1")
        selection_listbox.insert(2, "Page 2")
        selection_listbox.insert(3, "Page 3")
        selection_listbox.pack(side="left", fill="both")
        selection_listbox.bind('<<ListboxSelect>>', lambda event: pageselect(pages, event))

        # b1.pack(side="left")
        # b2.pack(side="left")
        # b3.pack(side="left")

        p1.show()

if __name__ == "__main__":
    root = tk.Tk()
    main = MainView(root)
    main.pack(side="left", fill="both", expand=True)
    root.wm_geometry("800x400")
    root.mainloop()