add new package py-absl-py (#11812)

* add new package py-absl-py

Change-Id: I248d30e0a3e5e05d9ea4027d97a85545c63d1125

* Update package.py

* Update package.py

* Update package.py

* Update package.py

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

+# 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 PyAbslPy(PythonPackage):
+    """
+    This repository is a collection of Python library code for building
+    Python applications.
+
+    The code is collected from Google's own Python code base, and has been
+    extensively tested and used in production.
+    """
+
+    homepage = "https://pypi.org/project/absl-py/"
+    url      = "https://pypi.io/packages/source/a/absl-py/absl-py-0.7.0.tar.gz"
+
+    version('0.7.0', sha256='8718189e4bd6013bf79910b9d1cb0a76aecad8ce664f78e1144980fabdd2cd23')
+    version('0.1.6', sha256='02c577d618a8bc0a2a5d1a51f160d3649745d7a2516d87025322f46ac1391a22')
+
+    depends_on('python@2.7:2.8,3.4:', type=('build', 'run'))
+    depends_on('py-six', type=('build', 'run'))
+    depends_on('py-enum34', type=('build', 'run'), when='^python@:3.3.99')