There appears to be an issue with the configparser installation process where the backports module is missing the
__init__.py file. You can find more details in this closed issue in the backports repo: https://bitbucket.org/brandon/backports/issues/5/missing-__init__py.
I don't run into this issue in Python 2.7.12, though I do with Python 2.7.14. Let me know what extra details you need!