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Data Hiding in Modules
As we’ve seen, a Python module exports all the names assigned at the top level of its file. There is no notion of declaring which names should and shouldn’t be visible outside the module. In fact, there’s no way to prevent a client from changing names inside a module if it wants to.
In Python, data hiding in modules is a convention, not a syntactical constraint. If you want to break a module by trashing its names, you can, but fortunately, I’ve yet to meet a programmer who would. Some purists object to this liberal attitude toward data hiding, claiming that it means Python can’t implement encapsulation. However, encapsulation in Python is more about packaging than about restricting.
