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/usr/lib/python2.7/dist-packages/tkinter/tix.py is in python-future 0.15.2-4ubuntu2.

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from __future__ import absolute_import

from future.utils import PY3

if PY3:
    from tkinter.tix import *
else:
    try:
        from Tix import *
    except ImportError:
        raise ImportError('The Tix module is missing. Does your Py2 '
                          'installation include tkinter?')