prerm is in python3.2-minimal 3.2.3-0ubuntu1.
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 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51  | #! /bin/sh -e
syssite=/usr/lib/python3.2/site-packages
localsite=/usr/local/lib/python3.2/dist-packages
remove_bytecode()
{
    pkg=$1
    max=$(LANG=C LC_ALL=C xargs --show-limits < /dev/null 2>&1 | awk '/Maximum/ {print int($NF / 4)}')
    dpkg -L $pkg \
	| awk -F/ 'BEGIN {OFS="/"} /\.py$/ {$NF=sprintf("__pycache__/%s.*.py[co]", substr($NF,1,length($NF)-3)); print}' \
	| xargs --max-chars="$max" echo \
	| while read files; do rm -f $files; done
    find /usr/lib/python3 /usr/lib/python3.2 -name dist-packages -prune -o -name __pycache__ -empty -print \
	| xargs -r rm -rf
}
case "$1" in
    remove)
	if [ "$DEBIAN_FRONTEND" != noninteractive ]; then
	    echo "Unlinking and removing bytecode for runtime python3.2"
	fi
	for hook in /usr/share/python3/runtime.d/*.rtremove; do
	    [ -x $hook ] || continue
	    $hook rtremove python3.2 || continue
	done
	remove_bytecode python3.2-minimal
	if which update-binfmts >/dev/null; then
	    update-binfmts --package python3.2 --remove python3.2 /usr/bin/python3.2
	fi
	if [ -h $syssite ]; then
	    rm -f $syssite
	fi
	[ -d $localsite ] && rmdir $localsite 2>/dev/null || true
	[ -d $(dirname $localsite) ] && rmdir $(dirname $localsite) 2>/dev/null || true
        ;;
    upgrade)
	remove_bytecode python3.2-minimal
        ;;
    deconfigure)
        ;;
    failed-upgrade)
        ;;
    *)
        echo "prerm called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
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