Easy.<p>Feature: print function.<p>Implementation: from __future__ import print_function<p>Yes, that magical, backwards-incompatible, print function has been in Python 2 all along!<p>Feature: unicode strings<p>Implementation: from __future__ import unicode_literals<p>Amazing! The magical, backwards-incompatible unicode strings backported to Python 2 with one single line.<p>I could go on and on.