Package/py configobj (#12639)

* new package: py-configojb

* add version 4.7.2

* improve dependencies

* fix url for versions > 5.0.0

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

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

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

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

* use format to create url strings

* fix typo

* improve style

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

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

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

@@ -0,0 +1,30 @@
+# 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 PyConfigobj(PythonPackage):
+    """Config file reading, writing and validation.
+    """
+
+    homepage = "https://github.com/DiffSK/configobj"
+    url      = "https://pypi.io/packages/source/c/configobj/configobj-5.0.6.tar.gz"
+
+    version('5.0.6', sha256='a2f5650770e1c87fb335af19a9b7eb73fc05ccf22144eb68db7d00cd2bcb0902')
+    version('4.7.2', sha256='515ff923462592e8321df8b48c47e3428f8d406ee22b8de77bef969d1af11171')
+
+    # The version on PyPi seems to be outdated (2014) although confusingly
+    # enough version number is the same as the latest release on github.
+    depends_on('py-six', type=('build', 'run'))
+    depends_on('python@2.7:2.8,3.4:', type=('build', 'run'))
+
+    def url_for_version(self, version):
+        if version <= Version('5.0.0'):
+            url = "https://pypi.io/packages/source/c/configobj/configobj-{0}.tar.gz"
+        else:
+            url = "https://github.com/DiffSK/configobj/archive/v{0}.tar.gz"
+
+        return url.format(version)