/usr/share/python3/debian_defaults is in python3-minimal 3.4.0-0ubuntu2.
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 6 7 8 9 10 11 12 | [DEFAULT]
# the default python3 version
default-version = python3.4
# all supported python3 versions
supported-versions = python3.4
# formerly supported python3 versions
old-versions = python3.1, python3.2, python3.3
# unsupported versions, including older versions
unsupported-versions = python3.1, python3.2, python3.3
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