from gi.repository import Gtk

import sys

class MyWindow(Gtk.ApplicationWindow):

    def __init__(self, app):

        Gtk.Window.__init__(self, title="What is your name?", application=app)

        self.set_default_size(300, 100)

        self.set_border_width(10)

        # a single line entry

        name_box = Gtk.Entry()

        # emits a signal when the Enter key is pressed, connected to the

        # callback function cb_activate

        name_box.connect("activate", self.cb_activate)

        # add the Gtk.Entry to the window

        self.add(name_box)

    # the content of the entry is used to write in the terminal

    def cb_activate(self, entry):

        # retrieve the content of the widget

        name = entry.get_text()

        # print it in a nice form in the terminal

        print("Hello " + name + "!")

class MyApplication(Gtk.Application):

    def __init__(self):

        Gtk.Application.__init__(self)

    def do_activate(self):

        win = MyWindow(self)

        win.show_all()

    def do_startup(self):

        Gtk.Application.do_startup(self)

app = MyApplication()

exit_status = app.run(sys.argv)

sys.exit(exit_status)