Countdown deadline

countdown.py

#!/usr/bin/python

from Tkinter import *
import ttk
import tkFont
#from Tkinter import font
import time
import datetime

global endTime 

def quit(*args):
    root.destroy()
            
def show_time():
    # Get the time remaining until the event
    remainder = endTime - datetime.datetime.now()
    # remove the microseconds part
    remainder = remainder - datetime.timedelta(microseconds=remainder.microseconds)
    # Show the time left
    txt.set(remainder)
    # Trigger the countdown after 1000ms
    root.after(1000, show_time)

# Use tkinter lib for showing the clock
root = Tk()
root.attributes("-fullscreen", True)
root.configure(background='black')
root.bind("x", quit)
root.after(1000, show_time)
# Set the end date and time for the countdown
endTime = datetime.datetime(2018, 3, 21, 0, 0, 0)

#appHighlightFont = font.Font(family='He', size=12, weight='bold')
#ttk.Label(root, text='Attention!', font=appHighlightFont).grid()

#fnt = tkFont.Font(font='DS-DIGIT', size=120, weight='bold')
txt = StringVar()
lbl = ttk.Label(root, textvariable=txt, font=("DS-Digital", 130, "bold"), foreground="yellow", background="black")
lbl.place(relx=0.5, rely=0.5, anchor=CENTER)
root.mainloop()