in python 2 and python 3

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As mention six is more elegant than import sys  try: except stuff.
A lot is under six.moves.
Also use future then can take quite a lot.

from __future__ import absolute_import, division, print_function, unicode_literals
from six.moves import input
from six.moves.urllib.request import urlopen
from six.moves import range

I think is best to not write code for Python 2.x anymore.
To move faster forward,Python 3.6 aslo has a lot features that can not be back ported.
Django 2.0 will drop Python 2.7 and 3.4,i think this is the right move.

Django 2.0 supports Python 3.5+. Since Django 1.11, support for Python 2.7 and 3.4 is removed.