Command works through terminal but not through python system call

Question

I'm trying to make a system call from a python code to the Boxer text parser program and I find that the following set of statements doesn't work. It doesn't give me any error but I don't see any output file created. When I run the same command on the terminal, the output file does get created.

from subprocess import call
candcStr = 'echo "Every Man Walks" | /home/candc-1.00/bin/candc --models /home/candc-1.00/models/boxer --output /tmp/test.ccg' 
args = shlex.split(candcStr)
call(args)

When I run the above code, the console shows

Every Man Walks | /home/candc-1.00/bin/candc --models /home/candc-1.00/models/boxer --output /tmp/test.ccg

It appears as though the pipe redirection isn't working. Does anyone know how I can fix this ? Thanks!

docs.python.org/2/library/…

Ashwini Chaudhary
– Ashwini Chaudhary

2013-04-07 22:08:09 +00:00
Commented Apr 7, 2013 at 22:08 — Ashwini Chaudhary
– Ashwini Chaudhary, Commented Apr 7, 2013 at 22:08

Martijn Pieters · Accepted Answer · 2013-04-07 22:07:14Z

4

You need to set shell=True for the shell to interpret the command, and most of all the pipe:

call(args, shell=True)

answered Apr 7, 2013 at 22:07

Martijn Pieters

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