One single tkinter program wont open on double click. I get no error message

Question

My code for an alarm in tkinter won't open on double click. It runs in idle just fine and all my other tkinter programs open on double click too. What in the code is causing this?

from tkinter import * 
import datetime
import time
from time import strftime
import winsound

master = Tk()  
master.geometry('300x300') 
master.title('Alarm Time') 

label = Label(master, text = 'What time would you like to wake up?') 
label.pack() 

EnteredAlarm = Entry(master) 
EnteredAlarm.pack(ipady=8)

def callback():           
    Alarm = EnteredAlarm.get()                
    while True:
        Time = strftime('%H:%M') 


        if str(Time) == str(Alarm): 
            print('Wake up Mister West')
            winsound.PlaySound('Alarm.wav', winsound.SND_FILENAME)
            break


        else:
            print('Zzz...')
            time.sleep(5)




b = Button(master, text="OK", command=callback)   
b.pack()

The code doesn't return any errors, all that happens is cmd opens for half a second then closes. Any help is appreciated, thanks in advance.

You call master.mainloop() right?

Nae
– Nae

2017-12-05 17:47:25 +00:00
Commented Dec 5, 2017 at 17:47 — Nae
– Nae, Commented Dec 5, 2017 at 17:47

SneakyTurtle · Accepted Answer · 2017-12-05 17:48:06Z

2

You need to add master.mainloop() at the end of your program, as the last logical line.

This forces the program to continually update everything.

answered Dec 5, 2017 at 17:48

SneakyTurtle

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3 Comments

Max Strange Over a year ago

I cannot believe that was it, thanks mate. All my other programs work without this which is why I was confused.

furas Over a year ago

@MaxStrange program can runs without mainloop() in IDLE because IDLE is created with tkinter and it runs mainloop() to work.

SneakyTurtle Over a year ago

No problem @MaxStrange. If you could mark the answer as correct then that would be great.

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