with the update last week (2.9.2019) we removed all remaining python34 packages, because
python3.4 has reached end of life (https://www.python.org/downloads/release/python-3410/)

And so the third party repository also don't offer it anymore.

DESY also provided some packages for 3.4 and not all of them are
rebuilded for 3.6 now. So if you miss a package give us an email
at maxwell.service@desy.de