New package: py-lws (#27536)

* [py-lws] added package

* added cython support

* updates for upstream

* updated py-lws with cython only option

* changes to py-lws for flake8

* [py-lws]

- update copyright
- url -> pypi

Co-authored-by: Sid Pendelberry <sid@rit.edu>

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

@@ -0,0 +1,25 @@
+# Copyright 2013-2021 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 PyLws(PythonPackage):
+    """Fast spectrogram phase recovery using Local Weighted Sums"""
+
+    homepage = "https://pypi.org/project/lws/"
+    pypi     = "lws/lws-1.2.6.tar.gz"
+
+    version('1.2.6', sha256='ac94834832aadfcd53fcf4a77e1d95155063b39adbce14c733f8345bdac76e87')
+
+    depends_on('python@3:',         type=('build', 'run'))
+    depends_on('py-cython',         type='build')
+    depends_on('py-setuptools',     type='build')
+    depends_on('py-numpy',          type=('build', 'run'))
+    depends_on('py-scipy',          type=('build', 'run'))
+
+    def setup_build_environment(self, env):
+        env.set('LWS_USE_CYTHON', 1)