postinst is in libpython3.4-minimal 3.4.0-2ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #! /bin/sh
set -e
if [ ! -f /etc/python3.4/sitecustomize.py ]; then
cat <<-EOF
# Empty sitecustomize.py to avoid a dangling symlink
EOF
fi
exit 0
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