Prevent Windows from sleeping (i.e. keep system awake)

keep_awake.pyw

import tkinter as tk
import ctypes
import sys

class myBox(tk.Tk):
    '''Prevents a Windows system from sleeping by keeping the screen alive.
    At the same time an excercise in using tkinter....
    (Python 3)
    Inspired by multiple code snippets on the net, certainly the 
    SetThreadExecutionState gimmick.
    '''
    def __init__(self):
        tk.Tk.__init__(self)
        #self.root = tk.Tk()
        self.geometry("200x100")
        self.label = tk.Label(self, text="Default settings.")
        self.label.pack(anchor='center')
        self.title("Stop Screen & thus Windows from sleeping")
        self.protocol("WM_DELETE_WINDOW", self.on_exit)
        
        self.button1 = tk.Button(self,
                                text="Default",
                                fg="green",
                                command=self.display_off)        
        self.button1.pack(side='left', anchor='e', expand=True)
        
        self.button2 = tk.Button(self,
                                text="Prevent Sleep",
                                fg="red",
                                command=self.display_on)         
        self.button2.pack(side='right', anchor='w', expand=True)
    
    def on_exit(self):
        self.display_off()
        self.destroy()
        
    def display_on(self):
        ctypes.windll.kernel32.SetThreadExecutionState(0x80000002)
        self.label['text'] = "PC always on!"
        
    def display_off(self):
        ctypes.windll.kernel32.SetThreadExecutionState(0x80000000)
        self.label['text'] = "Default: sleep on."

if __name__ == "__main__":
	myBox().mainloop()