RPy is a very simple, yet robust, Python interface to the R Programming
Language. It can manage all kinds of R objects and can execute arbitrary R
functions (including the graphic functions). All the errors from the R language
are converted to Python exceptions. Any module that later were installed on the
R system, can easily be used from within Python, without introducing any
changes.

rpy2 is a redesign and rewrite of rpy. It is providing a low-level interface to
R, a proposed high-level interface, including wrappers to graphical libraries,
as well as R-like structures and functions.