gnu: Add python-backports-csv.

* gnu/packages/python.scm (python-backports-csv, python2-backports-csv):
New variables.

gnu/packages/python.scm

@@ -6373,6 +6373,31 @@ connection to each user.")
 (define-public python2-backports-abc
   (package-with-python2 python-backports-abc))
 
+(define-public python-backports-csv
+  (package
+    (name "python-backports-csv")
+    (version "1.0.5")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "backports.csv" version))
+       (sha256
+        (base32
+         "1imzbrradkfn8s2m1qcimyn74dn1mz2p3j381jljn166rf2i6hlc"))))
+    (build-system python-build-system)
+    (home-page "https://github.com/ryanhiebert/backports.csv")
+    (synopsis "Backport of Python 3's csv module for Python 2")
+    (description
+     "Provides a  backport of Python 3's @code{csv} module for parsing
+comma separated values.  The API of the @code{csv} module in Python 2
+is drastically different from the @code{csv} module in Python 3.
+This is due, for the most part, to the difference between str in
+Python 2 and Python 3.")
+    (license license:psfl)))
+
+(define-public python2-backports-csv
+  (package-with-python2 python-backports-csv))
+
 (define-public python2-backports-shutil-get-terminal-size
   (package
     (name "python2-backports-shutil-get-terminal-size")