Print values at specific time with Tkinter

Question

I've written a command-base program and it works properly. Since I'd like to add some graphical interface, I prepared a simple one with Tkinter. But the line which contains "scheduler.run", it locks my application and I can't get any error code.

def do_deneme(p):
    etiket_run1["text"] = etiket_run1["text"] + str(p) + " completed at " + str(datetime.datetime.now())

def run_do():
    ...
    scheduler=sched.scheduler(time.time, time.sleep)
    for p in clean_information:
        scheduler.enter(float(p[12]), 1, do_deneme,(p,))
    etiket_run1["text"] = etiket_run1["text"] + str(datetime.datetime.now())
    scheduler.run()
    etiket_run1["text"] = etiket_run1["text"] + "Completed."

...
etiket_run1=Label(cerceve1, fg="red")
etiket_run1.pack(side=BOTTOM,padx=5,pady=5)
dugme = Button(cerceve2,text=u"Start",command=run_do)
...

Any way to debug this code part? or any suggestion about using scheduler.run with labels in Tkinter?

score 0 · Accepted Answer · answered Apr 19 '11 at 11:26

0

Tkinter is single-threaded. It appears that your scheduler sleeps until it is time to run something, so while it is sleeping your GUI will lock up.

The proper way to run something in the future or on a schedule with Tkinter is to call after which uses the event loop to schedule something to run after a set amount of time. You can either call it once if you want something to run a fixed number of milliseconds later, or you can repeatedly call it until some condition. By repeated, I mean you use after to call a function which checks the condition; if the condition is false the function will call itself again with after. If the condition is true, it runs your job.

answered Apr 19 '11 at 11:26

Bryan Oakley

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Bryan, thanks for the info. But is it possible to use scheduler.run with other GUIs, like wxpython? or any simple example for "after" usage? Sorry but I'm pretty new to Tkinter and other GUIs. – fish Apr 19 '11 at 12:10
@fish: see this answer for an example of using after: http://stackoverflow.com/questions/2400262/code-a-timer-in-a-python-gui-in-tkinter – Bryan Oakley Apr 19 '11 at 12:33

Print values at specific time with Tkinter

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