Window

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from gi.repository import Gtk
import sys

class MyApplication(Gtk.Application):
    def do_activate(self):
        # create a Gtk Window belonging to the application itself
        window = Gtk.Window(application=self)
        # set the title
        window.set_title("Welcome to GNOME")
        # show the window
        window.show_all()

# create and run the application, exit with the value returned by
# running the program
app = MyApplication()
exit_status = app.run(sys.argv)
sys.exit(exit_status)