gnu: Add python-numdifftools.

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

Change-Id: I0b5899e0bff10b488df5377c274eca63b26f9751

gnu/packages/python-science.scm

@@ -359,6 +359,50 @@ Features:
 @end itemize")
     (license license:bsd-2)))
 
+(define-public python-numdifftools
+  (package
+    (name "python-numdifftools")
+    (version "0.9.41")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "numdifftools" version))
+       (sha256
+        (base32 "1d49wd5jqnl0500jyws0vb7nv4dy4bb5ml4z9qx1n8867k6hbxsf"))))
+    (build-system pyproject-build-system)
+    (arguments
+     (list
+      #:test-flags #~(list "--pyargs" "numdifftools")
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-after 'unpack 'relax-requirements
+            (lambda _
+              (substitute* "setup.py"
+                ;; We can run tests without deprecated pytest-runner.
+                (("setup_requires.*") "")))))))
+    (native-inputs
+     (list python-algopy
+           python-line-profiler
+           python-pytest
+           python-setuptools
+           python-setuptools-scm
+           python-statsmodels
+           python-wheel))
+    (propagated-inputs
+     (list python-numpy
+           python-scipy))
+    (home-page "https://github.com/pbrod/numdifftools")
+    (synopsis "Solves automatic numerical differentiation problems")
+    (description
+     "This package implements a functionality to solve automatic numerical
+differentiation problems in one or more variables.  Finite differences are
+used in an adaptive manner, coupled with a Richardson extrapolation
+methodology to provide a maximally accurate result.  The user can configure
+many options like; changing the order of the method or the extrapolation, even
+allowing the user to specify whether complex-step, central, forward or
+backward differences are used.")
+    (license license:bsd-3)))
+
 (define-public python-osqp
   (package
     (name "python-osqp")