www-servers/tornado[curl] depends on dev-python/pycurl. The former has Python 3 and PyPy enabled, the latter doesn't support them.
There's a python 3 patch for pycurl on sourceforge that ubuntu is using; maybe we could give that a shot? http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/quantal/pycurl/quantal/view/head:/debian/patches/python3.patch http://sourceforge.net/tracker/?func=detail&aid=3188495&group_id=28236&atid=392779
+*pycurl-7.19.0-r3 (06 Feb 2013) + + 06 Feb 2013; Mike Gilbert <floppym@gentoo.org> + +files/pycurl-7.19.0-python3.patch, +pycurl-7.19.0-r3.ebuild: + Add support for Python 3. +
Well, there's still 3.1 against Tornado :P.
not any more