gnu: Add python-shellescape.

* gnu/packages/python-xyz.scm (python-shellescape): New variable.

gnu/packages/python-xyz.scm

@@ -56,7 +56,7 @@
 ;;; Copyright © 2018, 2019, 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2018 Luther Thompson <lutheroto@gmail.com>
 ;;; Copyright © 2018 Vagrant Cascadian <vagrant@debian.org>
-;;; Copyright © 2018 Pjotr Prins <pjotr.guix@thebird.nl>
+;;; Copyright © 2015, 2018 Pjotr Prins <pjotr.guix@thebird.nl>
 ;;; Copyright © 2019, 2020 Brett Gilio <brettg@gnu.org>
 ;;; Copyright © 2019 Sam <smbaines8@gmail.com>
 ;;; Copyright © 2019 Jack Hill <jackhill@jackhill.us>
@@ -16339,6 +16339,42 @@ security constraints (avoiding \"climb out\" from the archive), or for
 externally identiyfing sub-resources referenced by hypermedia formats.")
     (license license:asl2.0)))
 
+(define-public python-shellescape
+  (package
+    (name "python-shellescape")
+    (version "3.8.1")
+    (source
+      (origin
+        (method git-fetch)
+        (uri (git-reference
+               (url "https://github.com/chrissimpkins/shellescape")
+               (commit (string-append "v" version))))
+        (file-name (git-file-name name version))
+        (sha256
+         (base32
+          "0wzccxk139qx1lb2g70f5b2yh9zq15nr2mgvqdbfabg5zm0vf1qw"))))
+    (build-system python-build-system)
+    (arguments
+     '(#:phases
+       (modify-phases %standard-phases
+         (replace 'check
+           (lambda* (#:key tests? inputs outputs #:allow-other-keys)
+             (when tests?
+               (add-installed-pythonpath inputs outputs)
+               (invoke "python" "tests/test_shellescape.py"))
+             #t)))))
+    (native-inputs
+     `(("python-pytest" ,python-pytest)))
+    (home-page "https://github.com/chrissimpkins/shellescape")
+    (synopsis
+     "Shell escape a string to safely use it as a token in a shell command")
+    (description
+     "The shellescape Python module defines the @code{shellescape.quote()}
+function that returns a shell-escaped version of a Python string.  This is a
+backport of the @code{shlex.quote()} function from Python 3.8 that makes it
+accessible to users of Python 3 versions < 3.3 and all Python 2.x versions.")
+    (license license:expat)))
+
 (define-public python-validators
   (package
     (name "python-validators")