postinst is in python-tcpwrap 0.2-2.1ubuntu5.
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 | #!/bin/sh
set -e
# Automatically added by dh_pycentral
rm -f /var/lib/pycentral/python-tcpwrap.pkgremove
if which pycentral >/dev/null 2>&1; then
	pycentral pkginstall python-tcpwrap
	if grep -qs '^python-tcpwrap$' /var/lib/pycentral/delayed-pkgs; then
		sed -i '/^python-tcpwrap$/d' /var/lib/pycentral/delayed-pkgs
	fi
fi
# End automatically added section
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