There is a new 3.1 branch with releases, the most recent is 3.1.2: https://pypi.python.org/pypi/py2neo/3.1.2
commit 9fc7bca6aa5aeef0355668bdeb8fc46b3f07e484 Author: David Seifert <soap@gentoo.org> Date: Sun Jul 9 10:48:57 2017 -0700 dev-python/py2neo: Bump to 3.1.2 * EAPI 6 * Use PyPI for sources Bug: https://bugs.gentoo.org/show_bug.cgi?id=600464