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There is no "library-private" parameter in Python. However, in Python, variables and methods can be marked as private by prefixing them with a double underscore (__). This is called name mangling and is meant to indicate that the variable or method is intended to be used only within the class where it is defined and not by other parts of the code. However, it is not truly private, as it can still be accessed from outside the class by using the mangled name.