gnu: Add python-xlwt.

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

gnu/packages/python-xyz.scm

@@ -10368,6 +10368,37 @@ (define-public python-xlrd
 (define-public python2-xlrd
   (package-with-python2 python-xlrd))
 
+(define-public python-xlwt
+  (package
+    (name "python-xlwt")
+    (version "1.3.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "xlwt" version))
+       (sha256
+        (base32 "123c2pdamshkq75wwvck8fq0cjq1843xd3x9qaiz2a4vg9qi56f5"))))
+    (build-system python-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (replace 'check
+           (lambda* (#:key tests? #:allow-other-keys)
+             (when tests?
+               (setenv "PYTHONPATH"
+                       (string-append (getcwd) "/build/lib:"
+                                      (getenv "PYTHONPATH")))
+               (invoke "nosetests" "-v")))))))
+    (native-inputs
+     `(("nose" ,python-nose)))
+    (home-page "http://www.python-excel.org/")
+    (synopsis "Library for creating spreadsheet Excel files")
+    (description "@code{xlwt} is a library for writing data and formatting
+information to older Excel files (i.e. .xls).  The package itself is pure
+Python with no dependencies on modules or packages outside the standard Python
+distribution.  It is not intended as an end-user tool.")
+    (license license:bsd-3)))
+
 (define-public python-immutables
   (package
     (name "python-immutables")