Python interacting with zenity

[VCoolio]

After having googeled all afternoon I give up and start this thread. I have a commandline python script which I want to turn into a nautilus script. This requires that the script at some point uses a popup window to print a message instead of printing in the shell. The code was as follows:

   if ip_addr:
      print "Now serving on http://%s:%s/" % (ip_addr, httpd.server_port) 

I changed that successfully to

 if ip_addr:
      os.system('zenity --info --text="Now serving on http://%s:%s/"' % (ip_addr, httpd.server_port)) 

So far so good. Now comes the tricky part. I want a window that enables me to cancel the script or approve. This would mean a zenity --queston window, with a 'cancel' and a 'ok' button. In zenity 'cancel' returns the value '1', and 'ok' returns the value '0'. But how do I tell the script to react on these buttons? 'Cancel' would mean 'sys.exit ()' and 'ok' would mean 'continue'. I checked loads of documentation on the subprocess possibility (which seems to have replaced the os.popen command) but I don't understand how it works or how to have it interact with a window. Who helps me out? It doesn't have to be with zenity by the way. A gtk-window or whatever comes standard with Ubuntu is also ok.

[unutbu]

#!/usr/bin/env python
from subprocess import Popen

proc=Popen("zenity --question --text='Quit now?'", shell=True )
proc.communicate()
if proc.returncode:
    print "Cancel was pressed"
else:
    print "Ok was pressed" 

[Bodsda]

Hi.

If you use

zenity --question

ok returns 0
cancel returns 256

so you could do this

#! /usr/bin/env python
import os

question = os.system("zenity --question --text="continue?")
if question == 256:
    print "Operation canceled."
    exit()
else:
    print "Operation continuing." 

[VCoolio]

Thanks for your replies. I found out that 'cancel' gives 256 indeed. I don't know why the wiki on zenity says otherwise. However, someone got it working with the following:

 if ip_addr:
      userschoice = os.system('zenity --question --text "Does not matter now"')

   # To kill it if the users presses the cancel-button

   if '256' in str(userschoice):
      sys.exit (1) 

Problem solved. Thanks both for your help.

[imdano]

Thanks for your replies. I found out that 'cancel' gives 256 indeed. I don't know why the wiki on zenity says otherwise.

It does return one, but when you use os.system() you get the return value bit-shifted to the left by 8, because it uses the return code given by an internally used wait() call (see here for an explanation of its return code). To get the real return code you just shift it back.

>>> 256 >> 8
1

edit: If you want to get the correct rc right away, use the subprocess module

>>> import subprocess
>>> p = sp.Popen("zenity --question", shell=True)  # Dialog appeared after hitting enter, I clicked cancel
>>> p.poll()
1
>>> 

[Endolith]

First, install python-setuptools. Then, do this:

sudo easy_install pyzenity

Then do this:

if ip_addr:
  if not PyZenity.Question("Now serving on http://%s:%s/" % (ip_addr, httpd.server_port)):
    sys.exit