Description:

mxProxy is an extension package that provides a new type that is
suitable to implement Bastion like features without the need to use
restricted execution environments.

The type's main features are secure data encapsulation (the hidden
objects are not accessible from Python since they are stored in
internal C structures), customizable attribute lookup methods and a
cleanup protocol that helps in breaking circular references prior to
object deletion.

The latest version adds a very interesting new feature: weak
references which help you work with circular references in a way that
doesn't cause memory leakage in a Python system.