/usr/share/lintian/overrides/python3.5-dbg is in python3.5-dbg 3.5.3-1+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # just the gdb debug file
python3.5-dbg binary: python-script-but-no-python-dep
# pointless lintian ...
python3.5-dbg binary: hardening-no-fortify-functions
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