Non-blocking subprocess call

Kevin Walzer

I'm currently using os.popen in an application of mine, which calls for
non-blocking data, in this fashion:

self.file = os.popen('echo %s | sudo -S /sw/bin/fink -y install %s' %
(self.passtext, self.packagename), 'r', os.O_NONBLOCK)

What is the equivalent/comparable call in the new subprocess module? I
can't find any reference in the Python docs to non-blocking streams.

--
Kevin Walzer
Code by Kevin
http://www.codebykevin.com

Jun 2 '07 #1

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2371

Josiah Carlson

Kevin Walzer wrote:

I'm currently using os.popen in an application of mine, which calls for
non-blocking data, in this fashion:

self.file = os.popen('echo %s | sudo -S /sw/bin/fink -y install %s' %
(self.passtext, self.packagename), 'r', os.O_NONBLOCK)

What is the equivalent/comparable call in the new subprocess module? I
can't find any reference in the Python docs to non-blocking streams.

If you are talking about non-blocking reading and writing from the
subprocess, there isn't natively. But there is a cookbook entry:
http://aspn.activestate.com/ASPN/Coo.../Recipe/440554

- Josiah

Jun 2 '07 #2

Kevin Walzer

Josiah Carlson wrote:

>
If you are talking about non-blocking reading and writing from the
subprocess, there isn't natively. But there is a cookbook entry:
http://aspn.activestate.com/ASPN/Coo.../Recipe/440554

- Josiah

Any idea why this feature was removed from the language? It seems pretty
essential to me.

--
Kevin Walzer
Code by Kevin
http://www.codebykevin.com

Jun 2 '07 #3

Nick Craig-Wood

Kevin Walzer <kw@codebykevin.comwrote:

I'm currently using os.popen in an application of mine, which calls for
non-blocking data, in this fashion:

self.file = os.popen('echo %s | sudo -S /sw/bin/fink -y install %s' %
(self.passtext, self.packagename), 'r', os.O_NONBLOCK)

What is the equivalent/comparable call in the new subprocess module? I
can't find any reference in the Python docs to non-blocking
streams.

You'll probably be better off with the pexpect module for this

http://pexpect.sourceforge.net/

Doesn't work on windows. Looks like you are doing OS X though so
should work fine there

--
Nick Craig-Wood <ni**@craig-wood.com-- http://www.craig-wood.com/nick

Jun 4 '07 #4

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