Help need with subprocess communicate

Nicola Musatti nicola.musatti at
Fri Jun 6 10:40:10 CEST 2008

On Jun 4, 9:56 am, Dennis Lee Bieber <wlfr... at> wrote:
> On Tue, 3 Jun 2008 23:48:38 -0700 (PDT), rdab... at declaimed the
> following in comp.lang.python:
> > Is there way to configure the stdout buffer size so that it flushes
> > earlier..
> > Is there a way to make above mentioned piece code working?
>         I believe there is a command line argument that will set Python into
> an unbuffered mode... BUT, unless the spawned process/program has some
> similar option, you have no control over its output.

Which is why the Cookbook recipe I pointed to in my other message
appears to be a superior alternative. Its author works around this
problem by subclassing Popen to use non blocking I/O.

I used it to drive ClearCase's cleartool interactive tool and it works
very well. The only problem I encountered is that it doesn't mix well
with framework that have their own event loop (wxPython in my case),
but you can't really expect that to work.

Nicola Musatti

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