Need a simple "Hello World" example using the Webkit library in Python

Now with WebKitGtk2

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

from gi.repository import Gtk, WebKit2

window = Gtk.Window()
window.set_default_size(800, 600)
window.connect("destroy", Gtk.main_quit)

scrolled_window = Gtk.ScrolledWindow()
webview = WebKit2.WebView()
webview.load_uri("https://google.cl")
scrolled_window.add(webview)

window.add(scrolled_window)
window.show_all()
Gtk.main()

Did you check the Python bindings for the WebKit GTK+ port. In one of the directory there are demos on how to use it, including a browser: python demos/tabbed_browser.py

You could check also the slides of a FOSDEM by Alp Toker on WebKit GTK+ (pdf) Developing hybrid Web/GTK+ rich internet applications.

import gtk 
import webkit 

view = webkit.WebView() 

sw = gtk.ScrolledWindow() 
sw.add(view) 

win = gtk.Window(gtk.WINDOW_TOPLEVEL) 
win.add(sw) 
win.show_all() 

view.open("http://w3.org/") 
gtk.main()

That should give you good hints for starting.