dev-python/pika now supports python3* https://github.com/pika/pika/releases Please, add support in ebuild.
!PYTHON_COMPAT=( python2_7 python3_4 python3_5 pypy ) And yes, I confirm that it works with python3.
commit 8a4e9e367b215a641417d422758a67890a3ef530 Author: Matthew Thode <prometheanfire@gentoo.org> Date: Thu Mar 24 23:22:06 2016 -0500 dev-python/pika: adding python3 Package-Manager: portage-2.2.26