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/usr/share/python3/debian_defaults is in python3-minimal 3.4.0-0ubuntu2.

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[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