postrm is in python-twisted-core 11.1.0-1ubuntu2.
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 | #! /bin/sh
set -e
case "$1" in
remove|purge)
find /usr/lib/python[23].*/*-packages/twisted/plugins \
-name dropin.cache 2>/dev/null | xargs -r rm -f
for d in /usr/lib/python[23].*/*-packages/twisted/plugins; do
rmdir $d 2>/dev/null || true
done
;;
esac
exit 0
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