System versions

Mailman system information is available through the system object, which implements the ISystem interface.

>>> from mailman.interfaces.system import ISystem
>>> from mailman.core.system import system
>>> from zope.interface.verify import verifyObject

>>> verifyObject(ISystem, system)

The Mailman version is also available via the system object.

>>> print(system.mailman_version)
GNU Mailman ...

The Python version running underneath is also available via the system object.

# The entire python_version string is variable, so this is the best test
# we can do.
>>> import sys
>>> system.python_version == sys.version