Binary package “postgresql-plpython3-11” in ubuntu disco

PL/Python 3 procedural language for PostgreSQL 11

 PL/Python 3 enables an SQL developer to write procedural language functions
 for PostgreSQL 11 in Python 3. You need this package if you have any
 PostgreSQL 11 functions that use the languages plpython3 or plpython3u.
 PostgreSQL is an object-relational SQL database management system.