I wouldn't really trust the "Python 3 Wall Of Superpowers", as it doesn't appear to be anywhere near current. The first listed example of a 3.x incompatible package is requests[1], which is not only compatible with 2.7--3.4[2], but has been 3.x compatible since 2012-01-23[3].
[1]: http://docs.python-requests.org/en/latest/
[2]: http://docs.python-requests.org/en/latest/#feature-support
[3]: https://pypi.python.org/pypi/requests