PyPy is an alternate implementation of the Python 2.7.2 interpreter. PyPy's benefits are in the area of speed, memory usage, sandboxing and stacklessness. It is compatible with Cpython with some exceptions.
Install the pypy package
pacman -S pypy
Python libraries and programs can be installed in PyPy through easy_install. PyPy libraries are stored in a different folder then Cpython libraries.
easy_install does not come with the PyPy package and must be installed manually. Create the /opt/pypy/site-packages/ folder.
sudo mkdir /opt/pypy/site-packages/
Download distribute_setup.py to the folder /opt/pypy/ and run it. distribute_setup.py will install easy_install.
cd /opt/pypy/ sudo wget python-distribute.org/distribute_setup.py sudo pypy distribute_setup.py
easy_install will be located at /opt/pypy/bin/easy_install