On Sat, Aug 9, 2014 at 8:44 PM, Steven D'Aprano <steve@pearwood.info> wrote:
It is certainly required when writing code that will behave the same in
version 2 and 3

This is not true.  An alternative is to put

__metaclass__ = type

at the top of your module to make all classes in your module new-style in python2.