os.shell, recursion, encryption

[55555]

How does os.popen work?  I'm afraid that I don't understand pipes.  I 
thought they had something to do with commands like 'blah >> blah2' which 
would append blah2 with blah, right?  If that is a pipe then that's all I 
know what to do with it.  Can it be used to send a command like 'pkzip 
-sasdf asdf.zip *.txt' and return without generating a bunch of windows?  
Thanks.

On Mon, 14 Feb 2000 08:40:54 +0100, Gerrit Holl <gerrit.holl at pobox.com> 
wrote:
> 55555 at dakotacom.net wrote on 950483324:
> > I'm spawning pkzip for dos using os.shell() because I would like to 
use the encryption 
> > feature.  As far as I can tell that is not available in the gzip 
library and the 
> > documentation on the cryptography toolbox didn't give me the 
impression that all the bugs 
> > were worked out.  Does anyone know whether that has changed?
> 
> Hmm, please type your lines a little shorter.
> It's not a bug: cryptograhy and archiving are two different things. Only
> Dos/Windows archivers combine them in one program.
> 
> > Anyway, os.shell() pops up a new dos box for each call. I'm using 
os.path.walk() and 
> > making a lot of calls to the zip program.  I'm wondering if there is a 

way to not spawn 
> > 40 windows.  0 windows would be ideal.
> 
> What about os.system()? Or os.popen (does it exist on dos?)?
>
> > Finally, I'm wondering if there is a way to attach to a global 
variable while moving 
> > around with os.path.walk()?  I understand recursion and have read 
Python's scope rules 
> > but I can't seem to either pass local varaibles through or to attach 
to a global 
> > variable.
> 
> Have a look at the 'global' keyword.
> 
> regards,
> Gerrit.
> 
> -- 
> Homepage: http://www.nl.linux.org/~gerrit
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