Simple "Hello World" Dialog for Python

pythonui.py

import tkinter #in python 3.x: tkinter wird kleingeschrieben

window = tkinter.Tk()
window.title("TK Sample")
window.geometry("400x100")
frame = tkinter.Frame(window, relief="ridge", borderwidth=2)
frame.pack(fill="both",expand=1)
label = tkinter.Label(frame, text="Hello World!")
label.pack(expand=1)
button = tkinter.Button(frame,text="OK",command=window.destroy)
button.pack(side="bottom")

window.mainloop()