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Direct access to __private requires name mangling, e.g., _Class__private.

Abstraction reduces complexity by hiding implementation details.

The __ prefix makes an attribute private using name mangling, e.g., __value.

Encapsulation protects data by restricting direct access to class attributes.

_salary indicates a protected attribute, a convention in Python.

A Circle implementing area() might return 78.5 (π * r² for r=5), a valid abstraction.

An abstract base class defines a blueprint, enforcing method implementation.

The abc module provides tools for creating abstract base classes.

Calling an abstract method directly raises a TypeError.

An abstract class can have both abstract and concrete methods.

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