subprocess() arguments in Python

Question

I have an argument in Python that is screwing up my subprocess() command. The argument is:

--server-args="-screen 0, 1280x800x24"


args = [
  'xvfb-run',
  '--server-args="-screen 0, 1280x800x24"',
  '/usr/bin/python',
  '/root/AdamN-python-webkit2png-3ae4322/webkit2png.py',
  '-o',
  filename,
  url,
]

I think it's escaping the double quotes. Is there a work around for this?

this should be two distinct elements of the list, the same way -o and filename are different. — SilentGhost
– SilentGhost, Commented Oct 14, 2010 at 22:59
args = [ 'xvfb-run', '--server-args=', '"-screen=0, 1280x800x24"', '/usr/bin/python', '/root/AdamN-python-webkit2png-3ae4322/webkit2png.py', '-o', filename, 'google.com', ] /usr/bin/xvfb-run: line 173: "-screen=0, 1280x800x24": command not found — atomical
– atomical, Commented Oct 15, 2010 at 0:37

dr jimbob · Accepted Answer · 2012-07-19 18:01:40Z

2

While you've probably figured this out in the past two years, I had this same problem today. The solution:

import subprocess
subprocess.check_call(['xvfb-run', '-s', '-screen 0 1024x768x24', 
                       'CutyCapt', 
                       '--url=http://www.google.com/',
                       '--out=google.png'])

or

import subprocess
subprocess.check_call(['xvfb-run', '--server-args=-screen 0 1024x768x24', 
                       'CutyCapt', 
                       '--url=http://www.google.com/',
                       '--out=google4.png'])

Assuming you have xvfb installed. I am using CutyCapt as my sample application that requires an X framebuffer to run (its a program that converts webkit pages to images and requires an X server).

answered Jul 19, 2012 at 18:01

dr jimbob

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Comments

ndim · Accepted Answer · 2010-10-14 22:53:45Z

1

This is Python code, not a shell command line.

A shell command line eats the quotes to keep the spaces - in Python, the spaces are kept by a different means, so the quotes are passed on as-is and become part of the argument the called program actually sees.

answered Oct 14, 2010 at 22:53

ndim

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