# Write a Python program to Stack and StackSwitcher in GTK+ 3 
 import gi
# Since a system can have multiple versions
# of GTK + installed, we want to make 
# sure that we are importing GTK + 3.
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk
  
  
class StackWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self, title ="Geeks for Geeks")
        self.set_border_width(10)
  
        # Creating a box vertically oriented with a space of 100 pixel.
        vbox = Gtk.Box(orientation = Gtk.Orientation.VERTICAL, spacing = 100)
        self.add(vbox)
  
        # Creating stack, transition type and transition duration.
        stack = Gtk.Stack()
        stack.set_transition_type(Gtk.StackTransitionType.SLIDE_LEFT_RIGHT)
        stack.set_transition_duration(1000)
  
        # Creating the check button.
        checkbutton = Gtk.CheckButton("Yes")
        stack.add_titled(checkbutton, "check", "Check Button")
  
        # Creating label .
        label = Gtk.Label()
        label.set_markup("<big>Hello World</big>")
        stack.add_titled(label, "label", "Label")
  
        # Implementation of stack switcher.
        stack_switcher = Gtk.StackSwitcher()
        stack_switcher.set_stack(stack)
        vbox.pack_start(stack_switcher, True, True, 0)
        vbox.pack_start(stack, True, True, 0)
  
  
win = StackWindow()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()