escapes characters to safely assemble command lines

 This python3 library helps to escape a string to safely use it as a token in
 a shell command.
 .
 The shellescape Python module defines the shellescape.quote() function
 that returns a shell-escaped version of a Python string. This is a
 backport of the shlex.quote() function from Python 3.4.3 that makes
 it accessible to users of Python 3 versions < 3.3 and all Python 2.x
 versions.