libpython3.7-stdlib 3.7.3-2~18.10 (s390x binary) in ubuntu cosmic

 Python is a high-level, interactive, object-oriented language. Its 3.7 version
 includes an extensive class library with lots of goodies for
 network programming, system administration, sounds and graphics.
 .
 This package contains Python 3.7's standard library. It is normally not
 used on its own, but as a dependency of python3.7.