Code that will break in Python 4
Real life example of similar bug:
<a href="https://github.com/firebase/firepad/issues/167#issuecomment-100405275" rel="nofollow">https://github.com/firebase/firepad/issues/167#issuecomment-...</a>
=> <a href="https://github.com/firebase/firepad/commit/e732e6124c56ac0568d249c042c36a435303f7f6" rel="nofollow">https://github.com/firebase/firepad/commit/e732e6124c56ac056...</a>