Hello Sandro,
I got the same issue with ego and I solved the issue with:
$ sudo vim /etc/portage/package.use
# added with comment: solve problem for ego sync
>=app-admin/ego-2.4.2 python_targets_python3_6
>=sys-apps/portage-2.3.47 python_targets_python3_6
Then I selected Python 3_6 as default for my system with
$ sudo eselect python list
#then
$ sudo eselect python set 4
Then i reinstalled ego with:
$ sudo emerge --ask ego
After this I just ran:
$ ego sync
And everything works back like it should ^^, the main issue was that one day I updated my system with some python 3_4 flags and broke a part of the system, nothing to worried about or no need to re-install from scratch ^^
I see it is from 2017, but maybe it helps you and if not it may help another user.
Cheers and have fun :-)
