subprocess.popen question

[Gabriel Genellina]

En Wed, 20 Jun 2007 12:27:47 -0300, Eric_Dexter at msn.com  
<Eric_Dexter at msn.com> escribió:

> I am trying to modify a programming example and I am coming up with
> two problems...  first is that I can't seem to pass along the
> arguments to the external command (I have been able to do that with
> the old module and cmd is the command I wish to try) all the output
> seems to be returned as one line (at least when I run the program in
> spe).
>
> import subprocess
> from os import system
> cmd = """gawk -f altertime.awk -v time_offset=4 -v
> outfile="testdat.sco" "i1.sco" """
> #subprocess.Popen.
> last_line = subprocess.Popen(['gawk.exe'],
> stdout=subprocess.PIPE).communicate()[0]

You build what appears to be the desired command line, but execute  
gawk.exe instead.
Better split the arguments beforehand:
cmd = ["gawk", "-f", "altertime.awk", "-v", "time_offset=4", "-v",  
"outfile=testdat.sco", "i1.sco"]
Now, what do you want to do with the output? Printing it line by line?
output = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()[0]
lines = output.splitlines()
for line in lines:
   print line

-- 
Gabriel Genellina