Python quote command line arguments

Quote a command with arguments in python using pipes.quote() and shlex.quote(). Example:

import pipes

# Incorrect.
path = '/tmp/dir-without-spaces'
cmd = 'ls {0}'.format(path)

# Error.
path = '/tmp/dir with spaces'
cmd = 'ls {0}'.format(path)

# Also incorrect.
path = '/tmp/dir with spaces'
cmd = 'ls "{0}"'.format(path)

# Correct.
path = '/tmp/dir with spaces'
cmd = 'ls {0}'.format(pipes.quote(path))

Use pipes.quote() for python 2 and python 3.

Use shlex.quote() for python 3 only.