New package: py-uncertainties (#16997)

var/spack/repos/builtin/packages/py-uncertainties/package.py

@@ -0,0 +1,26 @@
+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PyUncertainties(PythonPackage):
+    """Transparent calculations with uncertainties on the quantities involved
+    (aka error propagation); fast calculation of derivatives
+    """
+
+    homepage = "https://uncertainties-python-package.readthedocs.io/en/latest/"
+    url      = "https://pypi.io/packages/source/u/uncertainties/uncertainties-3.1.4.tar.gz"
+
+    version('3.1.4', sha256='63548a94899f2a51eeb89b640f6ac311f481a8016b37dce157186e44619bc968')
+
+    variant('optional', default=False, description='Enable extra features involving numpy')
+    variant('docs',  default=False, description='Build with documentation')
+
+    depends_on('python@2.7:',   type=('build', 'run'))
+    depends_on('py-setuptools', type='build')
+    depends_on('py-future',     type=('build', 'run'))
+    depends_on('py-numpy',      type=('build', 'run'), when='+optional')
+    depends_on('py-sphinx',     type='build', when='+docs')