Yes I see that you want to add some notion of data encapsulation, but you haven’t told us how data encapsulation would improve Python. Data encapsulation in and of itself is not necessarily a good thing. I really like how you can mess around with Python objects.
This has been brought up before, though I can’t find those discussions right now, and I think the conclusion of those discussions were that since you cannot access the “raw” data (i.e. individual pointers and bytes in memory) of a class member the data is already encapsulated. At least in the sense that you can’t mess around and get memory errors. Please correct me if I’m wrong.