Django Install Error: " SyntaxError: future feature unicode_literals is not defined "

I am new to programming in general and I am struggling to install Django.
I downloaded the gar file, unzipped it and then attempted to do the " sudo
python setup.py install " command in the terminal (I'm working on a Mac OS
X 10.5.8) but was given the following message :

Traceback (most recent call last):
File "setup.py", line 80, in <module>
version = __import__('django').get_version()
File "/Users/byronprice/Downloads/Django-1.6.1/django/__init__.py", line
6, in get_version
from django.utils.version import get_version
File "/Users/byronprice/Downloads/Django-1.6.1/django/utils/version.py",
line 1
from __future__ import unicode_literals
SyntaxError: future feature unicode_literals is not defined

I imagine unicode_literals is part of the Python library and that perhaps
in version 3.3 the name was changed to something slightly different. Does
anyone have any ideas??