A backport of ChainMap from Python 3 to Python 2. get source from https://github.com/justanr/Py2ChainMap
go to download in pip: https://pypi.python.org/pypi/Py2ChainMap
A backport of ChainMap from Python 3 to Python 2. get source from https://github.com/justanr/Py2ChainMap
go to download in pip: https://pypi.python.org/pypi/Py2ChainMap