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Re: How to catch a line with Popen

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From Nobody <nobody@nowhere.com>
Subject Re: How to catch a line with Popen
Date Sat, 28 May 2011 23:15:06 +0100
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On Sun, 29 May 2011 00:01:56 +0800, TheSaint wrote:

> I'm looking into subprocess.Popen docs. I've launch the program with its
> arguments and that's smooth. I'm expecting to read the output by
> *comunicate()* at every line that prgram may blow during the process, but
> the output is given only when the child process is ended.

.communicate() reads until EOF, .wait()s for the process to terminate,
then returns the output as a pair of strings.

If you want to read data while the process is running, use the process'
.stdout and/or .stderr members, e.g.:

	p = subprocess.Popen(...)
	for line in p.stdout:
	    ...
	p.wait()

Don't forget to .wait() on the process when you're done, regardless of
whether you actually need the exit code.

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How to catch a line with Popen TheSaint <nobody@nowhere.net.no> - 2011-05-29 00:01 +0800
  Re: How to catch a line with Popen Nobody <nobody@nowhere.com> - 2011-05-28 23:15 +0100
  Re: How to catch a line with Popen Tim Roberts <timr@probo.com> - 2011-05-28 16:32 -0700
    Re: How to catch a line with Popen TheSaint <nobody@nowhere.net.no> - 2011-05-29 18:02 +0800
      Re: How to catch a line with Popen Chris Rebert <clp2@rebertia.com> - 2011-05-29 03:26 -0700
        Re: How to catch a line with Popen TheSaint <nobody@nowhere.net.no> - 2011-05-29 21:52 +0800
          Re: How to catch a line with Popen TheSaint <nobody@nowhere.net.no> - 2011-05-29 22:13 +0800
          Re: How to catch a line with Popen Chris Torek <nospam@torek.net> - 2011-05-30 01:02 +0000
            Re: How to catch a line with Popen TheSaint <nobody@nowhere.net.no> - 2011-05-30 23:29 +0800
              Re: How to catch a line with Popen Chris Torek <nospam@torek.net> - 2011-05-30 21:33 +0000
                Re: How to catch a line with Popen TheSaint <nobody@nowhere.net.no> - 2011-05-31 19:33 +0800

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