old_contents: ##############################################################################
  # Copyright (c) 2013-2017, 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/spack/spack
  # Please also see the NOTICE and LICENSE files 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 PyPackaging(PythonPackage):
      """Core utilities for Python packages."""
  
      homepage = "https://github.com/pypa/packaging"
      url      = "https://pypi.io/packages/source/p/packaging/packaging-16.8.tar.gz"
  
      import_modules = ['packaging']
  
      version('16.8', '53895cdca04ecff80b54128e475b5d3b')
  
      # Not needed for the installation, but used at runtime
      depends_on('py-six',       type='run')
      depends_on('py-pyparsing', type='run')
  
      # Newer versions of setuptools require packaging. Although setuptools is an
      # optional dependency of packaging, if it is not found, setup.py will
      # fallback on distutils.core instead. Don't add a setuptools dependency
      # or we won't be able to bootstrap setuptools.
  
      # depends_on('py-setuptools', type='build')
  
new_contents: ##############################################################################
  # Copyright (c) 2013-2017, 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/spack/spack
  # Please also see the NOTICE and LICENSE files 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 PyPackaging(PythonPackage):
      """Core utilities for Python packages."""
  
      homepage = "https://github.com/pypa/packaging"
      url      = "https://pypi.io/packages/source/p/packaging/packaging-17.1.tar.gz"
  
      import_modules = ['packaging']
  
      version('17.1', '8baf8241d1b6b0a5fae9b00f359976a8')
      version('16.8', '53895cdca04ecff80b54128e475b5d3b')
  
      # Not needed for the installation, but used at runtime
      depends_on('py-six',       type='run')
      depends_on('py-pyparsing', type='run')
  
      # Newer versions of setuptools require packaging. Although setuptools is an
      # optional dependency of packaging, if it is not found, setup.py will
      # fallback on distutils.core instead. Don't add a setuptools dependency
      # or we won't be able to bootstrap setuptools.
  
      # depends_on('py-setuptools', type='build')
  
subject: Add latest version of py-packaging (#7522)