Python countdown clock with GUI
Question: I'm having problems with a countdown clock that I was making in Python for a
Raspberry Pi. I need to have a countdown clock that counts down from 60
minutes. When time runs out it should display a red text "GAME OVER".

I've already made one using TKinter and a `for` loop for the actual timer but
I couldn't find any way to stop the `for` loop. I gave up on it.

Is there anyone nice enough to maybe write the actual timer and timer stopping
part? I'm good enough at python and TKinter to do everything else that I need.


Answer: I'd recommend using [generators](https://wiki.python.org/moin/Generators) to
handle your for loop and will provide a minimal **example** but on
StackOverflow no one is going to "write the **actual** timer and timer
stopping part" (see [What topics can I ask
here](http://stackoverflow.com/help/on-topic))

Note this is an example I had **before this question was posted** and thought
it would be helpful to you.

    
    
    import tkinter as tk
    
    def run_timer():
        for time in range(60):
            label["text"] = time #update GUI here
            yield #wait until next() is called on generator
    
    root = tk.Tk()
    
    label = tk.Label()
    label.grid()
    
    gen = run_timer() #start generator
    def update_timer():
        try:
            next(gen)
        except StopIteration:
            pass #don't call root.after since the generator is finished
        else:
            root.after(1000,update_timer) #1000 ms, 1 second so it actually does a minute instead of an hour
    
    update_timer() #update first time
    
    root.mainloop()
    

you will still need to figure out for yourself how to implement
`after_cancel()` to stop it and the red "GAME OVER" text.

