Hi,

The first alpha release in the 2.2.x series is out. The API is not yet 
frozen but is mostly in place.

With Linux, Python 2.6, and R-2.11 or R-2.12, it is believed to already 
be of comparable stability to the 2.1.x series. Less testing was done 
under OS X, and there is no currently for support for Windows.

Picking among other new features:

- This version will support Python 3 (thanks to a Google Summer of Code 
2010 and Greg). This is currently not very stable (running the tests 
results in a crash), but in a workable state to play a bit.

- better representation of NA and NULL from R ( 
http://rpy.sourceforge.net/rpy2/doc-2.2/html/vector.html#missing-values )

- easier to replace elements in arbitrary R vectors and arrays the "R 
way" ( 
http://rpy.sourceforge.net/rpy2/doc-2.2/html/vector.html#assigning-r-style )

- Ability to call Python functions from R code (and pass Python 
functions as callbacks used by R functions) ( 
http://rpy.sourceforge.net/rpy2/doc-2.2/html/rinterface.html#calling-python-functions-from-r
 
)

Some of the changes are changing the API found proposed in the 2.1.x 
series, but to a lower extent than 2.0.x-to-2.1.x did.

A list of visible changes is in the documentation ( 
http://rpy.sourceforge.net/rpy2/doc-2.2/html/changes.html )


One can either download the tarball from
( https://bitbucket.org/lgautier/rpy2/downloads/rpy2-2.2.0alpha0.tar.gz 
) or use a mercurial snapshot.

Try it early and report problems ( at 
https://bitbucket.org/lgautier/rpy2/issues?status=new&status=open ).


Laurent

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