[Python] In Python, how can I make unassignable attributes (like ones marked with `final` in...

Is there anything in Python that works like the final keyword in Java - i.e., to disallow assigning to a specific attribute of the instances of a class, after those instances have been created? I couldn't find anything like this in the documentation.

I'm creating a snapshot of an object (used for restoration if anything fails); once this backup variable is assigned, it should not be modified -- a final-like feature in Python would be nice for this.

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