gnu: Add python-unyt.

* gnu/packages/python-science.scm (python-unyt): New variable.

Signed-off-by: Sharlatan Hellseher <sharlatanus@gmail.com>

gnu/packages/python-science.scm

@@ -1287,6 +1287,34 @@ (define-public python-statannot
 annotations on an existing boxplots and barplots generated by seaborn.")
     (license license:expat)))
 
+(define-public python-unyt
+  (package
+    (name "python-unyt")
+    (version "3.0.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "unyt" version))
+       (sha256
+        (base32 "00900bw24rxgcgwgxp9xlx0l5im96r1n5hn0r3mxvbdgc3lyyq48"))))
+    (build-system pyproject-build-system)
+    ;; Astropy is an optional import, but we do not include it as it creates a
+    ;; module cycle: astronomy->python-science->astronomy.
+    (propagated-inputs (list python-h5py        ; optional import
+                             python-matplotlib  ; optional import
+                             python-numpy
+                             python-sympy))
+    ;; Pint is optional, but we do not propagate it due to its size.
+    (native-inputs (list python-pint python-pytest))
+    (home-page "https://unyt.readthedocs.io")
+    (synopsis "Library for working with data that has physical units")
+    (description
+     "@code{unyt} is a Python library working with data that has physical
+units.  It defines the @code{unyt.array.unyt_array} and
+@code{unyt.array.unyt_quantity} classess (subclasses of NumPy’s ndarray class)
+for handling arrays and scalars with units,respectively")
+    (license license:bsd-3)))
+
 (define-public python-upsetplot
   (package
     (name "python-upsetplot")