/usr/lib/x86_64-linux-gnu/libpython3.4dm.a is in libpython3.4-dbg 3.4.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/../python3.4/config-3.4dm-x86_64-linux-gnu/libpython3.4dm.a