You need to have either Python 2.6 or 2.7 installed.
If you have pip installed, you can simply do:
$ pip install pycassa
This will also install the Thrift python bindings automatically.
Make sure that you have Thrift’s python bindings installed:
$ pip install thrift
You can download a release from github or check out the latest source from github:
$ git clone git://github.com/pycassa/pycassa.git
You can simply copy the pycassa directory into your project, or you can install pycassa system-wide:
$ cd pycassa/
$ sudo python setup.py install