Python being Python, you can prevent non-malicious problems of the sort you mention (const and private functions / variables). Const via overwriting setattr / e

Python being Python, you can prevent non-malicious problems of the sort you mention (const and private functions / variables). Const via overwriting setattr / etc, private functions via stack inspection (among other things. There's a sliding scale of thoroughness versus clean code here.) Though it won't protect you from malicious intent (though this is still the case with C / etc), and it's caught at runtime as opposed to at compile time.