Mini python browser using Gnome Instrospection

pyweb.py

#!/usr/bin/python

from gi import require_version
require_version('Gtk', '3.0')
require_version('WebKit2', '4.0')
from gi.repository import Gtk, WebKit2, Gdk

Gtk.init()

win = Gtk.Window()
win.set_default_size(800,600)
win.connect('destroy', Gtk.main_quit)

accel = Gtk.AccelGroup()
accel.connect(Gdk.keyval_from_name('l'), Gdk.ModifierType.CONTROL_MASK, 0, lambda a1,a2,a3,a4: entry.grab_focus())
win.add_accel_group(accel)

box = Gtk.Box(orientation = Gtk.Orientation.VERTICAL)
win.add(box)

webview = WebKit2.WebView()
webview.connect('load-changed', lambda load_event, user_data:
                entry.set_text(webview.get_uri()) if user_data == WebKit2.LoadEvent.FINISHED
                else entry.set_text('Loading...'))
webview.load_uri('http://google.com')
box.pack_start(webview, True, True, 0)

entry = Gtk.Entry()
entry.connect('activate', lambda user_data: webview.load_uri(user_data.get_text()))
box.pack_start(entry, False, True, 0)

win.show_all()
Gtk.main()