spawnl and waitpid

[naima.mans@gmail.com]

hello,

I run a python cgi script under Apache...

and while the script is running i want to display a "please wait"
message until the script finish.

I have tried to do this but the "please wait" message appears at the
script end (which is useless at this time! )

here my script:
------------------------------------------------------------------------------------------------
def get_ret(status) :
signal = status & 0xff
if signal == 0:
retcode = status >8
else:
retcode = 0
return signal,retcode

pidActuel = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")

if ( get_ret(os.wait pid(pidActuel,0 ))[1] == 0 ):
print """ END"""
else:
print """ please wait... """

-------------------------------------------------------------------------------------------------

[naima.mans@gmail.com]

Re: spawnl and waitpid


i forgot ...
thanks for any help :)

[Thinker]

Re: spawnl and waitpid

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

naima.mans@gmai l.com wrote:

hello,
>
I run a python cgi script under Apache...
>
and while the script is running i want to display a "please wait"
message until the script finish.
>
I have tried to do this but the "please wait" message appears at
the script end (which is useless at this time! )
>

You should flush sys.stdout after you print messages, or
the message will keep in buffer untill buffer is full or process
terminated.


- --
Thinker Li - thinker@branda. to thinker.li@gmai l.com

http://heaven.branda.to/~thinker/GinGin_CGI.py

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Version: GnuPG v1.4.6 (FreeBSD)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

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cFoxm+jiZiIpKOf d+fHCt/M=
=9COv
-----END PGP SIGNATURE-----

[naima.mans@gmail.com]

Re: spawnl and waitpid

On 27 fév, 11:28, Thinker <thin...@branda .towrote:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
>
naima.m...@gmai l.com wrote:

hello,

>

I run a python cgi script under Apache...

>

and while the script is running i want to display a "please wait"
message until the script finish.

>

I have tried to do this but the "please wait" message appears at
the script end (which is useless at this time! )

>
You should flush sys.stdout after you print messages, or
the message will keep in buffer untill buffer is full or process
terminated.
>
- --
Thinker Li - thin...@branda. to thinker...@gmai l.comhttp://heaven.branda.t o/~thinker/GinGin_CGI.py
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (FreeBSD)
Comment: Using GnuPG with Mozilla -http://enigmail.mozdev .org
>
iD8DBQFF5Afi1LD UVnWfY8gRAgaoAJ 9fccAjo00QupE7S RFqgbmOUGZMugCg jvdH
cFoxm+jiZiIpKOf d+fHCt/M=
=9COv
-----END PGP SIGNATURE-----

Hello

thanks for answering
i have flush like this but same result .. the server wait until the
end...

pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")
sys.stdout.flus h()
ret = os.waitpid(pid, 0)

if ( ret[1] != 0):
print """ wait %i """ %ret[1]
sys.stdout.flus h()
else:
print """ end %i """ %ret[1]
sys.stdout.flus h()

[Thinker]

Re: spawnl and waitpid

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

naima.mans@gmai l.com wrote:

On 27 fév, 11:28, Thinker <thin...@branda .towrote:
naima.m...@gmai l.com wrote:

>>>hello, I run a python cgi script under Apache... and while
>>>the script is running i want to display a "please wait"
>>>message until the script finish. I have tried to do this but
>>>the "please wait" message appears at the script end (which is
>>>useless at this time! )

You should flush sys.stdout after you print messages, or the
message will keep in buffer untill buffer is full or process
terminated.
>

Hello

thanks for answering i have flush like this but same result .. the
server wait until the end...

pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ") sys.stdout.flus h() ret =
os.waitpid(pid, 0)

Your program will be blocked here until child process being terminated.
You should print your messages before this line.

if ( ret[1] != 0): print """ wait %i """ %ret[1]
sys.stdout.flus h() else: print """ end %i """ %ret[1]
sys.stdout.flus h()

- --
Thinker Li - thinker@branda. to thinker.li@gmai l.com

http://heaven.branda.to/~thinker/GinGin_CGI.py

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Version: GnuPG v1.4.6 (FreeBSD)
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0AZ83oVacK0hKik 4YC/jfCA=
=3h7d
-----END PGP SIGNATURE-----

[naima.mans@gmail.com]

Re: spawnl and waitpid

On 27 fév, 12:27, Thinker <thin...@branda .towrote:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
>
>
>
>
>
naima.m...@gmai l.com wrote:

On 27 f憝, 11:28, Thinker <thin...@branda .towrote:
naima.m...@gmai l.com wrote:

>>hello, I run a python cgi script under Apache... and while
>>the script is running i want to display a "please wait"
>>message until the script finish. I have tried to do this but
>>the "please wait" message appears at the script end (which is
>>useless at this time! )

You should flush sys.stdout after you print messages, or the
message will keep in buffer untill buffer is full or process
terminated.

>

Hello
thanks for answering i have flush like this but same result .. the
server wait until the end...
pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ") sys.stdout.flus h() ret =
os.waitpid(pid, 0)

>
Your program will be blocked here until child process being terminated.
You should print your messages before this line.
>

if ( ret[1] != 0): print """ wait %i """ %ret[1]
sys.stdout.flus h() else: print """ end %i """ %ret[1]
sys.stdout.flus h()

>
- --
Thinker Li - thin...@branda. to thinker...@gmai l.comhttp://heaven.branda.t o/~thinker/GinGin_CGI.py
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0AZ83oVacK0hKik 4YC/jfCA=
=3h7d
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>
- Afficher le texte des messages précédents -

thanks again

i have tried as you said (cf bellow) and same result...
is there any link which explain how a server Web read script and send
the answer ?

-------------------------------------------------------------------------
pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")
ret = os.waitpid(pid, 0)
print """please wait ...."""
sys.stdout.flus h()
# retourne le process id
if ( ret[1] != 0):
print """ wait %i """ %ret[1]
sys.stdout.flus h()
else:
print """ end %i """ %ret[1]
sys.stdout.flus h()
---------------------------------------------------------------------------
thanks

[Thinker]

Re: spawnl and waitpid

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

naima.mans@gmai l.com wrote:

i have tried as you said (cf bellow) and same result... is there
any link which explain how a server Web read script and send the
answer ?
-------------------------------------------------------------------------
pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")

print 'please wait...'

ret = os.waitpid(pid, 0)

You have missed my idea.
Since os.waitpid will be blocked, you should print your message before
calling os.waitpid().


- --
Thinker Li - thinker@branda. to thinker.li@gmai l.com

http://heaven.branda.to/~thinker/GinGin_CGI.py

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/dsGHttcJc/KGpx414I7rxw=
=E3o7
-----END PGP SIGNATURE-----

[naima.mans@gmail.com]

Re: spawnl and waitpid

On 27 fév, 18:54, Thinker <thin...@branda .towrote:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
>
naima.m...@gmai l.com wrote:

i have tried as you said (cf bellow) and same result... is there
any link which explain how a server Web read script and send the
answer ?
-------------------------------------------------------------------------
pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")

>
print 'please wait...'
>

ret = os.waitpid(pid, 0)

>
You have missed my idea.
Since os.waitpid will be blocked, you should print your message before
calling os.waitpid().
>
- --
Thinker Li - thin...@branda. to thinker...@gmai l.comhttp://heaven.branda.t o/~thinker/GinGin_CGI.py
>
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Version: GnuPG v1.4.6 (FreeBSD)
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>
iD8DBQFF5HA61LD UVnWfY8gRAu8sAJ 4n1dogsw7RzTxH8 Ke3xnNX6gXnRQCe MOKf
/dsGHttcJc/KGpx414I7rxw=
=E3o7
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hello

ha ok...

i tried this one and the browser don't write the message at once... I
have alos tried with thread and have the same result... :(

----------------------------------------------
pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")
print 'please wait...'
sys.stdout.flus h()
ret = os.waitpid(pid, 0)
# retourne le process id
if ( ret[1] != 0):
print """ wait %i """ %ret[1]
sys.stdout.flus h()
else:
print """ end %i """ %ret[1]
sys.stdout.flus h()
-----------------------------

--------- WITH THREAD ----------------

class AsyncLaunch(thr eading.Thread):
def __init__(self, infile):
threading.Threa d.__init__(self )
self.infile = infile
def run(self):
os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython",self.inf ile)
print 'Fin background'

print """please wait..."""
sys.stdout.flus h()
sys.stdout.clos e()
###### # print "<a href=\\\\Fr9033 256d\execute\%s >fichier de log </
a>" %config.nom_log
background = AsyncLaunch('Ma in.py')
background.star t()
######
print """The main program continues to run in foreground. wait..."""
print """ <a href='http://fr9033256d/cgi-bin/SARAT/go.py'>clic</a>"""
background.join () # Wait for background task to finish
print """Main program waited until background was done."""


-------------------
-----------------------

[Thinker]

Re: spawnl and waitpid

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

naima.mans@gmai l.com wrote:

On 27 fév, 18:54, Thinker <thin...@branda .towrote:

hello

ha ok...

i tried this one and the browser don't write the message at once...
I have alos tried with thread and have the same result... :(

Does child-process terminate it-self in a very short time ?
It can be a race condition, here.
You can try to sleep for a while in child-process to make sure parent
being executed. Parent process may not schedule to run immediately
after spawn. And, you can print some thing before os.spawnl() to make
sure that message can be delivered successfully.


- --
Thinker Li - thinker@branda. to thinker.li@gmai l.com

http://heaven.branda.to/~thinker/GinGin_CGI.py

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[naima.mans@gmail.com]

Re: spawnl and waitpid

On 27 fév, 19:31, Dennis Lee Bieber <wlfr...@ix.net com.comwrote:

On 27 Feb 2007 05:39:51 -0800, naima.m...@gmai l.com declaimed the
following in comp.lang.pytho n:
>
>
>

On 27 fév, 12:27, Thinker <thin...@branda .towrote:

-----BEGIN PGP SIGNED MESSAGE-----

<snip>
>

Your program will be blocked here until child process being terminated.
You should print your messages before this line.

>

i have tried as you said (cf bellow) and same result...

>
No, you did NOT do as was suggested (unless you misunderstood which
line "before this" meant.
>

is there any link which explain how a server Web read script and send
the answer ?

>

-------------------------------------------------------------------------
pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")
ret = os.waitpid(pid, 0)

>
As soon as you execute os.waitpid(), your script WAITS. NOTHING
after that point will happen until the process you are waiting on exits.
>

print """please wait ...."""
sys.stdout.flus h()
# retourne le process id
if ( ret[1] != 0):
print """ wait %i """ %ret[1]
sys.stdout.flus h()
else:
print """ end %i """ %ret[1]
sys.stdout.flus h()

>
pid = os.spawnl(os.P_ NOWAIT,
"c:\\python25\\ python.exe",
"python",
"Main.py") #apparently a Windows OS
print "Please wait ..."
sys.stdout.flus h()
ret = os.waitpid(pid, 0)
>
if ret[1]:
print "Non-zero exit code: %s %s" % (ret[1], ret[0])
else:
print "Successful exit"
sys.stdout.flus h()
>
{I'm presuming a 0 return code means success... VMS used 1 for success
and 0 for failure [actually, odd numbers were informational status, even
numbers were error status]}
>

---------------------------------------------------------------------------
thanks

>
--
Wulfraed Dennis Lee Bieber KD6MOG
wlfr...@ix.netc om.com wulfr...@bestia ria.com

HTTP://wlfraed.home.netcom.com/

(Bestiaria Support Staff: web-a...@bestiaria. com)
HTTP://www.bestiaria.com/

hello

thanks a lot..

sorry for misunderstandin g, my english isn't good (i'm french).

i have tried like this:
----------------------------------------------
#! C:/Python25/python.exe
# -*- coding: cp1252 -*-


import cgitb; cgitb.enable()
import os,sys

print "Content-Type: text/html"
print

pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")
print "please wait.."
sys.stdout.flus h()
ret = os.waitpid(pid, 0)
# retourne le process id
if ret[1]:
print "Non-zero exit code: %s %s" % (ret[1], ret[0])
else:
print "Successful exit"
sys.stdout.flus h()
--------------------------------------------------------

and the result:

At the end of the script execution it write:
==>>> please wait.. Successful exit

The browser doesn't let the script executing on background to write
the message at once.. it waits the end.


what happend?

[naima.mans@gmail.com]

Re: spawnl and waitpid

On 28 fév, 10:13, naima.m...@gmai l.com wrote:

On 27 fév, 19:31, Dennis Lee Bieber <wlfr...@ix.net com.comwrote:
>
>
>
>
>

On 27 Feb 2007 05:39:51 -0800, naima.m...@gmai l.com declaimed the
following in comp.lang.pytho n:

>

On 27 fév, 12:27, Thinker <thin...@branda .towrote:
-----BEGIN PGP SIGNED MESSAGE-----

<snip>

>

Your program will be blocked here until child process being terminated.
You should print your messages before this line.

>

i have tried as you said (cf bellow) and same result...

>

No, you did NOT do as was suggested (unless you misunderstood which
line "before this" meant.

>

is there any link which explain how a server Web read script and send
the answer ?

>

-------------------------------------------------------------------------
pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")
ret = os.waitpid(pid, 0)

>

As soon as you execute os.waitpid(), your script WAITS. NOTHING
after that point will happen until the process you are waiting on exits.

>

print """please wait ...."""
sys.stdout.flus h()
# retourne le process id
if ( ret[1] != 0):
print """ wait %i """ %ret[1]
sys.stdout.flus h()
else:
print """ end %i """ %ret[1]
sys.stdout.flus h()

>

pid = os.spawnl(os.P_ NOWAIT,
"c:\\python25\\ python.exe",
"python",
"Main.py") #apparently a Windows OS
print "Please wait ..."
sys.stdout.flus h()
ret = os.waitpid(pid, 0)

>

if ret[1]:
print "Non-zero exit code: %s %s" % (ret[1], ret[0])
else:
print "Successful exit"
sys.stdout.flus h()

>

{I'm presuming a 0 return code means success... VMS used 1 for success
and 0 for failure [actually, odd numbers were informational status, even
numbers were error status]}

>

---------------------------------------------------------------------------
thanks

>

--
Wulfraed Dennis Lee Bieber KD6MOG
wlfr...@ix.netc om.com wulfr...@bestia ria.com

HTTP://wlfraed.home.netcom.com/

(Bestiaria Support Staff: web-a...@bestiaria. com)
HTTP://www.bestiaria.com/

>
hello
>
thanks a lot..
>
sorry for misunderstandin g, my english isn't good (i'm french).
>
i have tried like this:
----------------------------------------------
#! C:/Python25/python.exe
# -*- coding: cp1252 -*-
>
import cgitb; cgitb.enable()
import os,sys
>
print "Content-Type: text/html"
print
>
pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")
print "please wait.."
sys.stdout.flus h()
ret = os.waitpid(pid, 0)
# retourne le process id
if ret[1]:
print "Non-zero exit code: %s %s" % (ret[1], ret[0])
else:
print "Successful exit"
sys.stdout.flus h()
--------------------------------------------------------
>
and the result:
>
At the end of the script execution it write:
==>>> please wait.. Successful exit
>
The browser doesn't let the script executing on background to write
the message at once.. it waits the end.
>
what happend?- Masquer le texte des messages précédents -
>
- Afficher le texte des messages précédents -

re hello

perhaps there is a link with the script being called..
as there is a function which use stdout:
here it is
--------------------------------------------
def erreur_ccm(cmd) :
try:
child_stdin, child_stdout, child_stderr =os.popen3(cmd)
stderr=child_st derr.read()
stdout=child_st dout.read()
if stderr == "":
retour = stdout
else :
retour = 0
except OSError, e:
child_stdin.clo se()
child_stdout.cl ose()
child_stderr.cl ose()

return retour
----------------------------------------------

[naima.mans@gmail.com]

Re: spawnl and waitpid

On 27 fév, 19:32, Thinker <thin...@branda .towrote:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
>
naima.m...@gmai l.com wrote:

On 27 f憝, 18:54, Thinker <thin...@branda .towrote:
hello
ha ok...
i tried this one and the browser don't write the message at once...
I have alos tried with thread and have the same result... :(

>
Does child-process terminate it-self in a very short time ?
It can be a race condition, here.
You can try to sleep for a while in child-process to make sure parent
being executed. Parent process may not schedule to run immediately
after spawn. And, you can print some thing before os.spawnl() to make
sure that message can be delivered successfully.
>
- --
Thinker Li - thin...@branda. to thinker...@gmai l.comhttp://heaven.branda.t o/~thinker/GinGin_CGI.py
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (FreeBSD)
Comment: Using GnuPG with Mozilla -http://enigmail.mozdev .org
>
iD8DBQFF5Hkp1LD UVnWfY8gRAtDdAK CKy8/ap5VJvZV14nhSCW YfLZdyYACffJ+Y
0sHMgyaQBmsOMwq/rxEvm1Q=
=qjTU
-----END PGP SIGNATURE-----

hello

oki, i have test a simple script that only wait...
when i tun the script without the server it write on 2 time which is
normal:
=============== =============== =============== ===
Content-Type: text/html
wait
The main program continues to run in foreground.
[[[[(((then after 5 second ))]]]]]]]
Fin background
Main program waited until background was done.
=============== =============== =============== =====

BUT when i call it under the server web it write after 5 second all
the message in 1 time :
=============== =============== =============== ======
wait The main program continues to run in foreground. Fin background
Main program waited until background was done.
=============== =============== =============== ======

-----------------------THE SCRIPT ---------------------------
import cgitb; cgitb.enable()
import os,sys
import threading, zipfile,time,Ma in

print "Content-Type: text/html"
print
print "wait"
sys.stdout.flus h()

class AsyncZip(thread ing.Thread):
def __init__(self, infile):
threading.Threa d.__init__(self )
self.infile = infile
def run(self):
time.sleep(5.0)
print 'Fin background'

background = AsyncZip('Main. py')
background.star t()
print 'The main program continues to run in foreground.'
sys.stdout.flus h()
background.join () # Wait for background task to finish
print 'Main program waited until background was done.'
sys.stdout.flus h()
---------------------------------------------------------------

[naima.mans@gmail.com]

Re: spawnl and waitpid

On 28 fév, 11:23, naima.m...@gmai l.com wrote:

On 27 fév, 19:32, Thinker <thin...@branda .towrote:
>
>
>
>
>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

>

naima.m...@gmai l.com wrote:

On 27 f憝, 18:54, Thinker <thin...@branda .towrote:
hello
ha ok...
i tried this one and the browser don't write the message at once...
I have alos tried with thread and have the same result... :(

>

Does child-process terminate it-self in a very short time ?
It can be a race condition, here.
You can try to sleep for a while in child-process to make sure parent
being executed. Parent process may not schedule to run immediately
after spawn. And, you can print some thing before os.spawnl() to make
sure that message can be delivered successfully.

>

- --
Thinker Li - thin...@branda. to thinker...@gmai l.comhttp://heaven.branda.. to/~thinker/GinGin_CGI.py
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (FreeBSD)
Comment: Using GnuPG with Mozilla -http://enigmail.mozdev .org

>

iD8DBQFF5Hkp1LD UVnWfY8gRAtDdAK CKy8/ap5VJvZV14nhSCW YfLZdyYACffJ+Y
0sHMgyaQBmsOMwq/rxEvm1Q=
=qjTU
-----END PGP SIGNATURE-----

>
hello
>
oki, i have test a simple script that only wait...
when i tun the script without the server it write on 2 time which is
normal:
=============== =============== =============== ===
Content-Type: text/html
wait
The main program continues to run in foreground.
[[[[(((then after 5 second ))]]]]]]]
Fin background
Main program waited until background was done.
=============== =============== =============== =====
>
BUT when i call it under the server web it write after 5 second all
the message in 1 time :
=============== =============== =============== ======
wait The main program continues to run in foreground. Fin background
Main program waited until background was done.
=============== =============== =============== ======
>
-----------------------THE SCRIPT ---------------------------
import cgitb; cgitb.enable()
import os,sys
import threading, zipfile,time,Ma in
>
print "Content-Type: text/html"
print
print "wait"
sys.stdout.flus h()
>
class AsyncZip(thread ing.Thread):
    def __init__(self, infile):
        threading.Threa d.__init__(self )
        self.infile = infile
    def run(self):
        time.sleep(5.0)
        print 'Fin background'
>
background = AsyncZip('Main. py')
background.star t()
print 'The main program continues to run in foreground.'
sys.stdout.flus h()
background.join ()    # Wait for background task to finish
print 'Main program waited until background was done.'
sys.stdout.flus h()
---------------------------------------------------------------- Masquer le texte des messages précédents -
>
- Afficher le texte des messages précédents -

hello

The pb seems to be solve but no idee why as i have done lot of
changes :/ (may be the last flush or the "\n".. i'm gone
investigate..)

THANKSSSSSSSSSS SSSSSSS for helping :)

for information here the code

----------------------------------------------------------

#! C:/Python25/python.exe -u
# -*- coding: cp1252 -*-
import cgitb; cgitb.enable()
import os, commands, time,Parser,con fig
import cgi

import sys,Function
sys.stderr = sys.stdout
print "Content-Type: text/html"
print

pid = os.spawnl(os.P_ NOWAIT,"c:\\pyt hon25\
\python.exe","p ython","Main.py ")
print "please wait...\n"
print """Le fichier de log est consultable sur \\\\fr9033256d
\execute\%s \n""" %config.nom_log
sys.stdout.flus h()
ret = os.waitpid(pid, 0)
if ret[1]:
print "Non-zero exit code: %s %s" % (ret[1], ret[0])
else:
print "Successful exit"
sys.stdout.flus h()