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#!/usr/bin/env python3
# -*- coding: utf8 -*-

import tkinter as tk
import time
import _thread
import os

def countdownThread():
    bstart["state"] = "disabled"
    bstop["state"] = "normal"
    global anhalten
    anhalten = 0
    t = eingabe.get()
    try:
        t = int(t)
        _thread.start_new_thread(countdown, (t,))
    except:
        status["text"] = "Ungültige Eingabe"
        bstart["state"] = "normal"
        bstop["state"] = "disabled"

def countdown(t):
    zeit = t
    status["text"] = "Countdown läuft"
    while zeit >= 0 and anhalten == 0:
        anzeige["text"] = zeit
        if zeit <= 10:
            anzeige["fg"] = "#FF0000"
        else:
            anzeige["fg"] = "#000000"
        time.sleep(1)
        zeit = zeit - 1
    bstart["state"] = "normal"
    bstop["state"] = "disabled"
    if anhalten == 0:
        status["text"] = "Countdown beendet"
        befehl()
    else:
        status["text"] = "Countdown abgebrochen"

def stop():
    global anhalten
    anhalten = 1
    bstop["state"] = "disabled"

def befehl():
    b = ebefehl.get()
    if b != "":
        os.system(b)
    anhalten = 0

main = tk.Tk()
main.title("Countdown")

status = tk.Label(main, text = "")
status.pack()

anzeige = tk.Label(main, font = "Arial 32 bold", text = "")
anzeige.pack()

lbeingabe = tk.Label(main, text = "Countdown in Sekunden:")
lbeingabe.pack()

eingabe = tk.Entry(main)
eingabe.pack()

lbbefehl = tk.Label(main, text = "Auszuführender Befehl:")
lbbefehl.pack()

lbbefehl2 = tk.Label(main, text = "(optional)")
lbbefehl2.pack()

ebefehl = tk.Entry(main)
ebefehl.pack()

bstart = tk.Button(main, text = "Start", command = countdownThread)
bstart.pack()

bstop = tk.Button(main, text = "Abbrechen", state = "disabled", command = stop)
bstop.pack()

main.mainloop()

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from time import time, sleep

duration = get_duration()
initial = time()
while time() < initial + duration:
    sleep(1)
# do something

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import tkinter as tk
import time

def countdown(zeit):
    while zeit >= 0:
        zeit = zeit - 1
        time.sleep(1)
        return(zeit)

main = tk.Tk()

zeit = 10
zeit = main.after(0, countdown(zeit))

lbcounter = tk.Label(main)
lbcounter["text"] = str(zeit)
lbcounter.pack()

main.mainloop()

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import tkinter as tk
import time

def countdown(zeit):
    zeit = zeit
    if zeit > 0:
        zeit = zeit - 1
        lbcounter["text"] = str(zeit)
        main.after(1000, countdown(zeit))

main = tk.Tk()

zeit = 10

lbcounter = tk.Label(main)
lbcounter.pack()
lbcounter["text"] = str(zeit)
main.after(1000, countdown(zeit))

main.mainloop()

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import tkinter as tk

def countdown(lbcounter, zeit):
    if zeit > 0:
        zeit = zeit - 1
        lbcounter["text"] = str(zeit)
        main.after(1000, countdown, lbcounter, zeit)

main = tk.Tk()

zeit = 10

lbcounter = tk.Label(main)
lbcounter.pack()
lbcounter["text"] = str(zeit)
main.after(1000, countdown, lbcounter, zeit)

main.mainloop()

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import tkinter as tk
import os

def countdown(lbCountdown, zeit):
    global abbruch
    if abbruch == False:
        lbCountdown["text"] = zeit
        zeit = int(zeit)
        if zeit > 0:
            if int(zeit) <= 10:
                lbCountdown["fg"] = "#FF0000"
            zeit = zeit - 1
            zeit = str(zeit)
            main.after(1000, countdown, lbCountdown, zeit)
        else:
            status(2)
            befehl()


def countdownStart():
    status(1)
    lbCountdown["fg"] = "#000000"
    global abbruch
    abbruch = False
    zeit = eZeit.get()
    main.after(0, countdown, lbCountdown, zeit)

def countdownAbbruch():
    status(3)
    global abbruch
    abbruch = True

def status(s):
    """s erwartet 1, 2 oder 3:
    1 = Countdown läuft
    2 = Countdown beendet
    3 = Countdown abgebrochen"""
    if s == 1:
        lbStatus["text"] = "Countdown läuft"
        bStart["state"] = "disabled"
        bAbbruch["state"] = "normal"
    if s == 2:
        lbStatus["text"] = "Countdown beendet"
        bStart["state"] = "normal"
        bAbbruch["state"] = "disabled"
    if s == 3:
        lbStatus["text"] = "Countdown abgebrochen"
        bStart["state"] = "normal"
        bAbbruch["state"] = "disabled"

def befehl():
    b = eBefehl.get()
    if b != "":
        os.system(b)

main = tk.Tk()

lbStatus = tk.Label(main)
lbStatus.pack()

lbCountdown = tk.Label(main, font = "Arial 32 bold")
lbCountdown.pack()

lbZeit = tk.Label(main, text = "Dauer in Sekunden:")
lbZeit.pack()

eZeit = tk.Entry(main)
eZeit.pack()

lbBefehl = tk.Label(main, text = "Auszuführender Befehl:")
lbBefehl.pack()

lbBefehl2 = tk.Label(main, text = "(optional)")
lbBefehl2.pack()

eBefehl = tk.Entry(main)
eBefehl.pack()

bStart = tk.Button(main, text = "Start", command = countdownStart)
bStart.pack()

bAbbruch = tk.Button(main, text = "Abbruch", command = countdownAbbruch)
bAbbruch["state"] = "disabled"
bAbbruch.pack()

main.mainloop()

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def befehl():
    b = eBefehl.get()
    if b != "":
        subprocess.Popen(b)

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Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.1/tkinter/__init__.py", line 1402, in __call__
    return self.func(*args)
  File "/usr/lib/python3.1/tkinter/__init__.py", line 490, in callit
    func(*args)
  File "tk_countdown-v2.py", line 21, in countdown
    befehl()
  File "tk_countdown-v2.py", line 58, in befehl
    subprocess.Popen(b)
  File "/usr/lib/python3.1/subprocess.py", line 647, in __init__
    errread, errwrite)
  File "/usr/lib/python3.1/subprocess.py", line 1158, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

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"mousepad"

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"play countdown.wav"