Hello! So, subj says itself :)
*** This bug has been marked as a duplicate of bug 652584 ***
commit e22b1478b0dac6ccc3f762ebb087938d4ceef6bd Author: Mart Raudsepp <leio@gentoo.org> Date: Thu Apr 5 15:33:10 2018 +0300 gnome-base/gnome-shell: add python3.6 compat gnome-shell-extension-tool works fine, gnome-shell-perf-tool was broken before already (reported as bug #652584) Package-Manager: Portage-2.3.28, Repoman-2.3.9