[Baypiggies] Subprocess: Common problem/common pattern

[James Tatum]

Google turns up a number of requests for this functionality, and a draft PEP[0].

Did you see this module[1]? It adds an event callback for subprocess output.

[0] http://www.python.org/dev/peps/pep-3145/
[1] http://code.activestate.com/recipes/576957-asynchronous-subprocess-using-asyncore/

On Sat, Oct 2, 2010 at 10:17 AM, Glen Jarvis <glen at glenjarvis.com> wrote:
> I'm sorry, I thought I was more clear with my test case. Obviously, I was
> not.
>
> The problem is this:
>     Python programs can call subprocesses. The python program can wait until
> the subprocess has finished and print the output captured. However, what we
> want is to print the output immediately as it is generated.
>     So, instead of waiting for the subprocess to finish, the python program
> could continue -- printing the results as given by the subprocess.  From the
> way the test case is written, the communicate() method will wait until the
> subprocess is finished *before* it prints the results that were found.
> Thanks for asking for clarification. You weren't the only person asking, so
> obviously I wasn't clear enough in defining the problem.
>
> Cheers,
>
> Glen
> On Sat, Oct 2, 2010 at 10:13 AM, Aahz <aahz at pythoncraft.com> wrote:
>>
>> On Sat, Oct 02, 2010, Glen Jarvis wrote:
>> >
>> > I've now seen a common problem come up several times. And, I imagine
>> > there
>> > is a common solution to this problem that I don't know.
>>
>> Could you explain what the problem is?  I think it's related to buffering
>> and pipes, but it's not clear from your post.
>> --
>> Aahz (aahz at pythoncraft.com)           <*>
>> http://www.pythoncraft.com/
>>
>> "If you think it's expensive to hire a professional to do the job, wait
>> until you hire an amateur."  --Red Adair
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>
>
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