Thanks for the explications Tom. I didn't realize the consequently to use a
string like in my example.
Sorry for my bad post
2012/3/1 Tom Evans <tevans...@googlemail.com>
> On Thu, Mar 1, 2012 at 11:42 AM, Sébastien Billion
> <sebastien.bill...@gmail.com> wrote:
> > Hi,
> >
> > You can try something like that:
> >
> > p = subprocess.Popen(args=[("%s %s") % (script_name,command_args1)],
>
> Sorry to pick on something seemingly inconsequential, but this really
> riles me. If you launch a subprocess using a string like "command arg1
> arg2 arg3", then you force the OS to do additional work to spawn the
> process via the shell. at which point the shell then has to re-parse
> the arguments that you passed to it.
>
> So, what's the big deal?
>
> If command_args1 was the string 'hello world', then the suggested
> approach would not work. The argument would be split into two separate
> arguments by the shell. You already know which argument you want and
> where you want it, so just pass them through appropriately with a
> list.
>
> The only 'benefit' going through a shell is that you can rely on the
> shell searching $PATH to find the 'right' executable. As I've
> intimated, this isn't much of a benefit.
>
> OP:
>
> Are you showing us precisely the code that runs? WFM…
>
> >>> import sys
> >>> import subprocess
> >>> p=subprocess.Popen([sys.executable, 'hello.py', 'sdfg'],
> stdout=subprocess.PIPE)
> >>> p.communicate()
> ('hello\n', None)
>
>
> Cheers
>
> Tom
>
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