PCPP-32-101 1.7 Understand Attribute Encapsulation PCPP-32-1 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   What is the benefit of combining getter, setter, and deleter methods in a single class?

   • AIt eliminates the need for private attributes.
   • BIt provides a complete, controlled interface for reading, modifying, and deleting an attribute.
   • CIt automatically makes the class immutable.
   • DIt allows direct access to the private attribute from outside the class.
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2. 7foundation · easy

   What is the primary role of attribute encapsulation in a class?

   • ATo make all attributes private so that they cannot be accessed at all.
   • BTo allow unrestricted access to all attributes from anywhere in the program.
   • CTo restrict direct access to an object's internal state and provide controlled interaction.
   • DTo ensure that attributes are always stored in a database.
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4. 8foundation · easy

   In Python, how is a private attribute typically indicated?

   • ABy using a leading underscore, e.g., `_name`
   • BBy using the `@private` decorator on the attribute.
   • CBy using a single trailing underscore, e.g., `name_`
   • DBy using the `private` keyword before the attribute name.
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5. 9expert · hard

   A team is building a `ShoppingCart` class. The `_items` attribute is a list of product IDs. The team wants to ensure that items can only be added or removed through methods, and that the cart can be cleared. However, some team members argue that making `_items` private is unnecessary because Python does not enforce it. What is the strongest argument for encapsulation in this case?

   • AIt makes the code run faster because the list is not exposed.
   • BIt prevents other developers from accidentally using the wrong method to modify the cart.
   • CIt allows the class to be used in a multi-threaded environment safely.
   • DIt allows the team to change the internal data structure (e.g., from a list to a set) without breaking external code.
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6. 10foundation · easy

   What is the purpose of a getter method in an encapsulated class?

   • ATo make the attribute public.
   • BTo delete the attribute from the object.
   • CTo directly modify the value of a private attribute.
   • DTo retrieve the value of an encapsulated attribute in a controlled manner.
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