popen question

Marc 'BlackJack' Rintsch bj_666 at gmx.net
Tue Jan 8 10:38:50 CET 2008


On Tue, 08 Jan 2008 09:20:16 +0000, Robert Latest wrote:

> The program "slow" just writes the numbers 0 through 9 on stdout, one line a 
> second, and then quits.
> 
> I would have expected the python program to spit out a numbers one by one, 
> instead I see nothing for 10 seconds and then the whole output all at once.
> 
> How can I get and process the pipe's output at the pace it is generated?

Both processes have to make their communication ends unbuffered or line
buffered.  See the documentation of `os.popen()` for the `bufsize`
argument.  And do whatever is needed to output the numbers from ``slow``
unbuffered or line buffered.

Ciao,
	Marc 'BlackJack' Rintsch



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