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RES: While loop and time.sleep function

Alves, Carlos Alberto - Coelce calves at coelce.com.br
Sat Feb 23 08:50:02 EST 2002 
Thanks for your help!
But, for me, it only works properly under interactive sections (don't forget
I'm under Windows ;-)).
So, to make it works as I desire (accepting 'double-click' and 'enter' to
launching application) I just put two small lines in your code(see below). 
Now, the code is running just fine.
> -----Mensagem original-----
> De: Eric Brunel [mailto:eric.brunel at pragmadev.com]
> Enviada em: quinta-feira, 21 de fevereiro de 2002 16:42
> Assunto: Re: While loop and time.sleep function
> 
> 
> Hi,
> 
> Alves, Carlos Alberto - Coelce wrote:
> > Hi all,
> > I tray to make a simple clock program ( see the code below ).
> > Can someone explain to me why code 01 works while code 02 doesn't
> [snip]
> 
> Eeer, in fact both codes didn't work... At least on my Linux 
> box. The first 
> problem is that there is no mainloop, so Tk never actually 
> starts. The 
> second problem is that since the control never returns to Tk 
> (because of 
> the "while 1"), Tk never gets a chance to refresh the 
> display. So you must 
> explicitely refresh it manually:
> 
> -----------------------
> from Tkinter import *
> import time
> 
> class Clock:
>   def __init__(self,root):
>     self.lb=Label(root,padx=5,pady=5,fg='blue',font=('Times',20))
>     self.lb.pack()
>     self.ck()
>     self.update()
>   def ck(self):
>     self.lb.configure(text=time.asctime()[11:19])
>     # Refresh the display; otherwise, nothing happens...
>     self.lb.update_idletasks()
>   def update(self):
>     while 1:
>       self.ck()
>       time.sleep(1)
> 
> if __name__=='__main__':
>   root=Tk()
>   root.title('Clock')

    root.update()	

>   Clock(root)

    root.update()

>   # Run Tk main loop
>   root.mainloop()
> -------------------------------
> 
> HTH
>  - eric -
> 
> 
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