Text not showing up

[Simone]

Hi all, I am new to python and trying to write a simple GUI that would 
call 2 growisofs processes (dvd burning) at the same time, and retrive 
the exit code to be printed on a text box (couldn't find any program 
that could use multiple dvd burners, not even k3b). Excuse me if this is 
really a simple problem, but two days of googling didn't help.
 The program is really simple, I developed the GUI using glade and it 
works.
The only thing I would like to improve is that I'd like it to show in 
the text boxes messages like "Waiting for use input" or "Burning dvd 
please wait", but it looks like even though I don't have any error, the 
message won't show up until the burning process is finished (showing 
either "burning successfully" or "an error occurred").
I am not sure I made myself clear on this, but I will post the relevant 
code trying to explain it:

import os, sys
import gtk.glade
       
class DVD:
   
 
    def __init__(self):
        print "Initializing the Graphic User Interface: This may take 
some time"
        self.xml=gtk.glade.XML("./dvd2.xml") 
        self.window=self.xml.get_widget("dvd")
        self.xml.signal_connect('on_quit_clicked', self.Quit)
        self.xml.signal_connect('on_burn_clicked', self.Burn)   
        
self.OrdKeys=["comboentry1","entry1","spinbutton1","entry2","esitotext","esitotext1"]  
# here esitotext is the box I want the text to show up



    def Quit(self, *args):
        gtk.mainquit()

    def Burn(self, *args):

        comand=""
        comand2=""

        name=self.xml.get_widget("entry1").get_text()            #name 
for the dvd
        path=self.xml.get_widget("comboentry1").get_text()   #path to 
dvd AUDIO_TS and VIDEO_TS
        num=self.xml.get_widget("spinbutton1").get_text()      #chosing 
the number of dvd to burn
        pub=self.xml.get_widget("entry2").get_text()                
#publisher
        self.xml.get_widget("esitotext").set_text("Waiting for 
input")     #    THIS NEVER SHOWS UP

       
        dvd1="/dev/hda"                         # this is the first dvd 
burner, edit as needed
        dvd2="/dev/hdc"                         # this is the second dvd 
burner, edit as needed



        comand+="growisofs -dvd-compat -Z "+dvd1+" -dvd-video -V 
"+name+" -publisher "+pub+" "+path 
        comand2+="growisofs -dvd-compat -Z "+dvd2+" -dvd-video -V 
"+name+" -publisher "+pub+" "+path


        if num == "1":
            self.xml.get_widget("esitotext").set_text("Burning the dvd, 
please wait")    #      THIS NEVER SHOWS UP, unless i have an error and 
the program
                                                                        
                                                       #      quits 
before executing the command
            self.xml.get_widget("esitotext").show()                     
                                   #      don't know if this is correct, 
but it doesn't work either
            f = os.popen(comand, 'r')
            line = f.readline()

            error_in_prog = f.close()
            if error_in_prog:
                error=str(error_in_prog)
                self.xml.get_widget("esitotext").set_text("An error 
occurred. Burn not completed")  # THIS COMES UP as it should
                self.xml.get_widget("esitotext").show()
            else:
                self.xml.get_widget("esitotext").set_text("Burn 
completed successfully")                    # THIS COMES UP as it should
                self.xml.get_widget("esitotext").show()


if __name__=='__main__':
    main=DVD()
    gtk.main()


Any comment, help, url, really appreciated.

Have a nice day
Simone