prerm is in python2.7-minimal 2.7.11-7ubuntu1.
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  | #! /bin/sh
set -e
case "$1" in
    remove)
	if [ "$DEBIAN_FRONTEND" != noninteractive ]; then
	    echo "Unlinking and removing bytecode for runtime python2.7"
	fi
	for hook in /usr/share/python/runtime.d/*.rtremove; do
	    [ -x $hook ] || continue
	    $hook rtremove python2.7 || continue
	done
	if which update-binfmts >/dev/null; then
	    update-binfmts --package python2.7 --remove python2.7 /usr/bin/python2.7
	fi
	localsite=/usr/local/lib/python2.7/dist-packages
	[ -d $localsite ] && rmdir $localsite 2>/dev/null || true
	[ -d $(dirname $localsite) ] \
	    && rmdir $(dirname $localsite) 2>/dev/null || true
        ;;
    upgrade)
        ;;
    deconfigure)
        ;;
    failed-upgrade)
        ;;
    *)
        echo "prerm called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
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