py-pygresql: new package (#9922)

* py-pygresql: new package

* Added dependency on py-setuptools, as the build will use it if present

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

@@ -0,0 +1,19 @@
+# Copyright 2013-2018 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 PyPygresql(PythonPackage):
+    """PyGreSQL is an open-source Python module that interfaces to a
+       PostgreSQL database"""
+
+    homepage = "http://www.pygresql.org"
+    url      = "http://www.pygresql.org/files/PyGreSQL-5.0.5.tar.gz"
+
+    version('5.0.5', 'c7d1558e85568d3369a98609174ca6a0')
+
+    depends_on('py-setuptools', type='build')
+    depends_on('postgresql', type=('build', 'run'))