The main page: http://www.web2py.com/
Says, "Runs on Windows, Mac, Unix/Linux, Google App Engine, Amazon EC2, and almost any web hosting via Python 2.4/2.5/2.6, or Java with Jython." The PyPI page, here: http://pypi.python.org/pypi/web2py/1.85.3 Says, "Platform: CPython/Jython 2.4,2.5,2.6,2.7 on Windows, Linux, Mac, Unix, Windows Mobile" I have 2.7 installed at home, and after checking the main page I almost uninstalled 2.7. Luckily I managed to look around a bit first. The main page should not be less up-to-date than other sources.
