[Python] How should secrets be securely stored in Python variables so that they can't be read...

Unlike most languages, Python doesn't have private member variables, and so cannot force other code to interact with its member variables via class methods. How are secure python programs written to prevent unauthenticated reading of variables containing secrets and such?

I read this Stack Exchange thread stating that there are no private member variables in python, but none of the answers explained what one should do in place of a private member variable.

This Stack Exchange thread states that restricting access to member variables is only a pretense of security, not actually secure, and I don't understand what one is meant to do instead.

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