prerm is in dput 0.9.6.2ubuntu1.
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 | #!/bin/sh
set -e
dpkg --listfiles dput | awk '$0~/\.py$/ {print $0"c\n" $0"o"}' | xargs rm -f >&2
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