Python 3 - tkinter ttk (Tk Themed Widgets) - GUI Hello World

Here is some boilerplate code for setting up a basic GUI application with ttk in Python 3.1:

#!/usr/bin/env python
# Python 3


import tkinter
from tkinter import ttk

class Application:
    def __init__(self, root):
        self.root = root
        self.root.title('Hello World')
        ttk.Frame(self.root, width=200, height=100).pack()
        ttk.Label(self.root, text='Hello World').place(x=10, y=10)

if __name__ == '__main__':
    root = tkinter.Tk()
    Application(root)
    root.mainloop()

This example shows usage of the Frame and Label widgets, and some basic layout management using pack() and place(). It renders on Ubuntu (with Gnome) like this: