py3versions - print python3 version information
py3versions [-h] [-v] [<options>]
py3versions prints information about installed, supported python3 runtimes, the default runtime, and parses the information of the PythonVersion fields in the package control file for Python3.
-d, --default Show the default python3 version.
-s, --supported Show the supported python3 versions.
-r, --requested [<version string>|<control file>] Reads the value of the X-Python3-Version field in the source section of a control file and shows all matching python3 versions. The parameter is interpreted as a version string, if it is not the name of a file. If the X-Python3-Version field is missing, it will fall back to list the supported Python3 versions after checking debian/control. Versions less than 3 are ignored. The keyword all is ignored because it covers all Python2 versions. The former keyword current is not supported at all in Python3.
-i, --installed Show the installed supported python3 versions.
-v, --version Limit the output to the version numbers of the python3 versions.
Matthias Klose