import htmlPy
class BackEnd(htmlPy.Object):
def __init__(self, app):
    super(BackEnd, self).__init__()
    self.app = app

@htmlPy.Slot()
def say_hello_world(self):
    self.app.html = u"Hello, world"
                </code>

            </pre>
    </td>
    <td>
    <h3>GUI <br> <small class="typewriter">main.py</small></h3>
        <pre>
            <code class="language-python">

import htmlPy
from back_end import BackEnd
app = htmlPy.AppGUI(
title=u"Sample application")
app.maximized = True
app.template_path = "."
app.bind(BackEnd(app))
app.template = ("index.html", {})
if name == "main":
app.start()