postinst is in python-minimal 2.7.15~rc1-1.
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 | #! /bin/sh
set -e
python2.7 -m compileall /usr/share/python/ >/dev/null
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