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the double underscore (__) prefix is used to denote so-called "private" class members, i.e. class attributes or methods that are intended to be used only within the class or its subclasses, and should not be accessed directly from outside the class. When a class member is given a double underscore prefix, the interpreter automatically mangles the name of the member by adding a prefix and a suffix to it. This is done to prevent name clashes between class members with the same name but defined in different classes.
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