The current stable Psycopg release is 2.7.1:
There is currently no testing release.
See the install page for instructions about how to install Psycopg from source.
pip install -U pip # make sure to have an up-to-date pip pip install psycopg2
without needing to meet the prerequisites required to build the package from source.
All the Psycopg releases (both branches 2.0 and the now obsolete 1.0) are available for download.