Tkinter TkMessageBox not closing after click OK

Question

I have created a script in Python which notifies me at a given event. I am using the following function to produce the warning window:

def window_warn():
    '''
    This function will throw up a window with some text
    '''
    #These two lines get rid of tk root window
    root = Tkinter.Tk()
    root.withdraw()
    #tkMessageBox.deiconify() 
    TkMessageBox.showwarning("New Case", "You have a new case\n Please restart pycheck")
    return

The window draws fine, but when I click ok, the window stays in place with the button depressed. Im using xfce. Is there anyway to get the window to close after ok is clicked?

A comment indicated this may be to do with surrounding code, so for completeness:

print "Just started newcase check"
while True:
    if "Uncommitted" in webpage:
        print "oh look, 'Uncommitted' is in the url returned from the last function"
        #If this hits we call a notification window
        window_warn()
        print "sleeping"
        time.sleep(10)

        webpage = scrape_page()
    else:
        print "nothing"
        time.sleep(20)
        webpage = scrape_page()

Answer 1

Try calling root.update() before returning from the function. That will process all pending Tk/X window events.

(ideally, you'd establish a main event loop before displaying the window, but that assumes that your entire program is event driven, which may not always work.)