From the django docs:
After installing Memcached itself, you\'ll need to install a memcached binding. There are several python memcached bindings availabl
Just do pip install python-memcached
and you should be good.
As for installing memcached itself, it depends on the platform you are on.
brew install memcached
sudo apt-get install memcached
On OS X/Linux, just run memcached
in the command line.