prerm is in python-mode 1:6.1.3-1.
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  | #!/bin/sh
set -e
# Automatically added by dh_installemacsen
if [ -e /var/lib/emacsen-common/state/package/installed/emacsen-common ] ; then
	/usr/lib/emacsen-common/emacs-package-remove --prerm python-mode
fi
# End automatically added section
# Automatically added by dh_python2:
if which pyclean >/dev/null 2>&1; then
	pyclean -p python-mode 
else
	dpkg -L python-mode | grep \.py$ | while read file
	do
		rm -f "${file}"[co] >/dev/null
  	done
fi
# End automatically added section
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