new package: py-scs (#13477)

* new package: py-scs

* rename

* flake8

* Update var/spack/repos/builtin/packages/py-scs/package.py

Co-Authored-By: Adam J. Stewart <ajstewart426@gmail.com>

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

@@ -0,0 +1,43 @@
+# Copyright 2013-2019 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 PyScs(PythonPackage):
+    """SCS: splitting conic solver"""
+
+    homepage = "https://github.com/cvxgrp/scs"
+    url      = "https://www.pypi.io/packages/source/s/scs/scs-2.1.1-2.tar.gz"
+
+    version('2.1.1-2', sha256='f816cfe3d4b4cff3ac2b8b96588c5960ddd2a3dc946bda6b09db04e7bc6577f2')
+
+    variant('cuda', default=False, description="Also compile the GPU CUDA version of SCS")
+    variant('float32', default=False, description="Use 32 bit (single precision) floats, default is 64 bit")
+    variant('extra_verbose', default=False, description="Extra verbose SCS (for debugging)")
+    variant('int32', default=False, description="Use 32 bit ints")
+    variant('blas64', default=False, description="Use 64 bit ints for the blas/lapack libs")
+
+    depends_on('py-setuptools', type='build')
+    depends_on('py-numpy@1.7:', type=('build', 'run'))
+    depends_on('py-scipy@0.13.2:', type=('build', 'run'))
+
+    def build_args(self, spec, prefix):
+        args = []
+        if '+cuda' in spec or '+float32' in spec or '+int32' in spec or\
+                '+extra_verbose' in spec or '+blas64' in spec:
+            args = ['--scs']
+        if '+cuda' in spec:
+            args.append('--gpu')
+        if '+float32' in spec:
+            args.append('--float')
+        if '+extra_verbose' in spec:
+            args.append('--extraverbose')
+        if '+int32' in spec:
+            args.append('--int')
+        if '+blas64' in spec:
+            args.append('--blas64')
+        return args