Trivial example of a TK UI in Python

test.py

#!/usr/local/bin/python3

from tkinter import *

def donothing():
    filewin = Toplevel(root)
    button = Button(filewin, text="Do nothing button")

root = Tk()
menubar = Menu(root)
filemenu = Menu(menubar, tearoff = 0)
filemenu.add_command(label="New", command = donothing)
menubar.add_cascade(label = "File", menu = filemenu)
root.config(menu = menubar)
root.mainloop()