How to write code that works in both Python 2 and Python 3?

Question

A Django website I maintain currently uses Python 2.7 but I know that I\'ll have to upgrade it to Python 3 in a couple of months. If I\'m writing code right now that has to

Answer 1

six and future is a golden rule, enough to make easy a coming migration

add to every python2 file, this as first line:

from __future__ import absolute_import, unicode_literals

use below working with strings, iteration, metaclasses, ...

isinstance(sth, six.string_types)

six.iteritems(dict)

@six.add_metaclass(Meta)

and so on six reference