PCPP-32-101 1.3 Understand and Use Inheritance, Polymorphism, and Composition PCPP-32-1 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Given the following code, which class is the direct parent of class C? class A: pass class B(A): pass class C(B): pass

   • AB
   • BC
   • CA
   • Dobject
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2. 17foundation · easy

   Which statement accurately compares inheritance and composition?

   • AComposition requires the use of abstract base classes, while inheritance does not.
   • BInheritance creates a tight coupling between parent and child, while composition creates a looser coupling by using objects as components.
   • CInheritance is always better than composition because it is simpler to implement.
   • DInheritance allows runtime changes to the class hierarchy, while composition does not.
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4. 18expert · hard

   A developer has the following classes: class A: pass; class B(A): pass; class C(A): pass; class D(B, C): pass. The developer wants to add a method `describe` to B and C. When an instance of D calls `describe()`, which class's method is invoked?

   • AB's method
   • BAn error is raised due to ambiguity
   • CA's method
   • DC's method
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5. 19expert · hard

   A developer has the following classes: class X: pass; class Y: pass; class Z(X, Y): pass; class W(Y, X): pass. The developer tries to create class V(Z, W). What happens?

   • AA TypeError is raised because the MRO cannot be consistent
   • BV is created successfully with MRO V, Z, W, X, Y
   • CA RuntimeError is raised because of duplicate inheritance
   • DV is created successfully with MRO V, Z, W, Y, X
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6. 20foundation · easy

   How should a has-a relationship be modeled in Python?

   • ABy using a class method that returns an instance of the other class.
   • BBy using composition, where one class contains an instance of another class as an attribute.
   • CBy using a global variable to store the instance.
   • DBy using inheritance, where one class inherits from another class.
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