/usr/share/debhelper/autoscripts/preinst-pycentral is in python-central 0.6.17ubuntu1.
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 | case "$1" in
install|upgrade)
mkdir -p /var/lib/pycentral
echo '# the presence of this file allows calling pkgremove on upgrade' \
> /var/lib/pycentral/#PACKAGE#.pkgremove
esac
|