The Python script 'explain_sam_flags.py' is distributed in
'/usr/share/libhtsjdk-java/' as a convenience for the users, but
the package does not depend on it.  It was converted using 2to3
from Python to Python3.  You can install the default
Python3 version in Debian with the following command:

   sudo apt-get install python3

 -- Andreas Tille <tille@debian.org>  Tue, 17 Apr 2018 15:14:40 +0200