simple hello world tkinter

tk_hello_world.py

import sys
from tkinter import *
"""
A simple hello world written in python and tkinter
"""
#setup size for the root window
width = 200
height = 100

root = Tk() #Creates a root window

label1 = Label(root)                                                    #creates the first label
label1.config(text='Hello world!')                                      #configure the label
label1.pack(side=TOP, expand=YES, fill=BOTH)                            #packs this into the root window

button1 = Button(None, text="press me to exit", command=sys.exit)       #creates your first button  with a sys.exit command to exit the GUI
button1.pack(side=LEFT, expand=YES, fill=X)                             #packs this into the root window
root.title('hello world')                                               #titles the root window
root.geometry('{}x{}'.format(width, height))                            #resize the window so that it isnt just a tiny blob
root.mainloop()