preinst is in python-migrate 0.11.0-2.
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 | #!/bin/sh
set -e
if [ "$1" = upgrade ] && dpkg --compare-versions "$2" lt 0.5.3-1; then
pycentral pkgremove python-migrate
fi
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