spack/lib/spack/external/ordereddict_backport.py

##############################################################################
# Copyright (c) 2013-2018, 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
##############################################################################
"""This file dispatches to the correct implementation of OrderedDict."""

# TODO: this file, along with py26/ordereddict.py, can be removed when
# TODO: support for python 2.6 will be dropped

# Removing this import will make python 2.6
# fail on import of ordereddict
from __future__ import absolute_import

import sys

if sys.version_info[:2] == (2, 6):
    import ordereddict
    OrderedDict = ordereddict.OrderedDict
else:
    import collections
    OrderedDict = collections.OrderedDict