Chris Green cl at
Thu Jan 19 17:40:19 UTC 2012

On Thu, Jan 19, 2012 at 12:30:14PM -0500, Ash Wyllie wrote:
> I have a task that would be trivial on my old Amigas using Arexx. 
> I have a folder with a bunch of 30 minute mp3s in it. I would like to
> resample them and them split them in to 5 minute segments.
> Soundconverter and mp3split can do the work, and python can find the
> file names. 
> But is there a way to have python call on external programs?
There's several ways that Python can call external programs, in order of
complexity/capability (all of these are in the Python os module) :-

        Simple call of cmd, all you get back is the return code of cmd

    os.popen(cmd, mode='I', bufsize=-1)
        Runs cmd and allows you to read its stdout (default mode 'I'),
        or by changing mode to write to its stdin.

    os.popen2(), os.popen3(), os.popen4()
        Similar to popen() but allow various combinations of stdin,
        stdout and stderr to be read/written.

        Several functions which use the system's underlying C functions
        of the same names to run programs with various combinations of
        arguments, environment etc.


Chris Green

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