How to pause Python while Tkinter window is open?

Question

I'm writing a program that sometimes encounters an error. When it does, it pops up a Tkinter dialog asking the user whether to continue. It's a more complicated version of this:

keep_going = False
KeepGoingPrompt(keep_going)
if not keep_going:
    return

The prompt sets keep_going to True or leaves it False. Problem is, the code seems to continue while KeepGoingPrompt is open. I tried storing a reference to the prompt and adding a loop like

while prompt:
    time.sleep(1)

but python gets stuck in the loop and freezes. Is there a better way to do it?

Thanks

chaos95 · Accepted Answer · 2010-10-15 00:49:41Z

1

You can use the tkMessageBox class to pop up a question dialog that is modal and won't return until the user clicks a button. See the Tkinter book for details.

answered Oct 15, 2010 at 0:49

chaos95

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4 Comments

jefdaj Over a year ago

I tried that, but can't really tell if it's working because it seems to have caused some other odd bugs. But that's probably just something else in my code gone wrong. :(

chaos95 Over a year ago

Are you able to describe these bugs? It might give some indication as to whether they're related to the dialog call; since tkMessageBox is essentially a very simple wrapper for the Windows MessageBox API call I'd say it's unlikely that it's a problem with the call itself.

jefdaj Over a year ago

Well, fixed the error I was having. But now there's a new (maybe simpler?) one: the messagebox just gets skipped, same as my original dialog.

jefdaj Over a year ago

OK, pressing enter submits the comment. Good to know. Anyway, I fixed it. Instead of storing the result of tkMessageBox(), I just used "if not tkmessageBox(): return", and that seems to work. Thanks!

George Karpenkov · Accepted Answer · 2010-10-15 00:50:20Z

0

1) Are you running your code inside IDLE? It might be responsible for making the dialogue non-blocking while it really should be blocking.

2) If running outside IDLE does not help, look for tkinter/dialogue options which specify whether behavior is blocking or non-blocking

answered Oct 15, 2010 at 0:50

George Karpenkov

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1 Comment

jefdaj Over a year ago

Not IDLE, but I am running inside an experimental program with sort of a non-standard python interpreter in it. There could easily be something wacky in there. :)

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