add package py-statsmodels and py-patsy (#3265)

* add package py-statsmodels and py-patsy

* fixed typo

* fixed urls

* removed rc version

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

@@ -0,0 +1,44 @@
+##############################################################################
+# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/llnl/spack
+# Please also see the LICENSE file for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License (as
+# published by the Free Software Foundation) version 2.1, February 1999.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+# conditions of the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+from spack import *
+
+
+class PyPatsy(PythonPackage):
+    """A Python package for describing statistical models and for
+    building design matrices."""
+
+    homepage = "https://github.com/pydata/patsy"
+    url      = "https://pypi.io/packages/source/p/patsy/patsy-0.4.1.zip"
+
+    version('0.4.1', '9445f29e3426d1ed30d683a1e1453f84')
+
+    variant('splines', description="Offers spline related functions")
+    variant('tests', description="allows nose tests")
+
+    depends_on('py-setuptools',  type='build')
+    depends_on('py-numpy',       type=('build', 'run'))
+    depends_on('py-scipy',       type=('build', 'run'), when="+splines")
+    depends_on('py-nose',        type=('build', 'run'), when="+tests")
+    depends_on('py-six',         type=('build', 'run'))