PCAP-31-03 4.5 Build a Class Hierarchy Using Inheritance PCAP-31 Practice Questions (Page 2)

Questions 6–10

1. 6application · easy

   A developer defines `class Shape: def area(self): return 0` and `class Rectangle(Shape): def __init__(self, w, h): self.w = w; self.h = h; def area(self): return self.w * self.h`. What does `Rectangle(3, 4).area()` return?

   • A0
   • B7
   • C12
   • DAn AttributeError
   Reveal Solution Discussion Select an answer first
2. 7application · easy

   A developer has `class Vehicle: pass` and `class Car(Vehicle): pass`. They create `c = Car()`. Which expression evaluates to `True`?

   • Aisinstance(c, Vehicle)
   • Bisinstance(Vehicle(), Car)
   • Cisinstance(c, object) == False
   • Dtype(c) is Vehicle
   Reveal Solution Discussion Select an answer first
4. 8expert · hard

   A developer defines `class A: def m(self): return "A"`, `class B(A): pass`, `class C(A): def m(self): return "C"`, and `class D(B, C): pass`. What does `D().m()` return?

   • A"B"
   • BAn AttributeError
   • C"C"
   • D"A"
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   In the diamond problem, what is the main issue that arises in multiple inheritance?

   • AA class cannot inherit from more than one class at a time.
   • BA class inherits from two classes that have a common ancestor, creating ambiguity about which ancestor's method to use.
   • CThe base class's methods are always called, ignoring overrides.
   • DThe order of inheritance does not affect method resolution.
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   Given the following code: class Book: def __init__(self, title): self.title = title def __str__(self): return self.title b = Book("Python Basics") print(str(b)) What is the output?

   • AAn error is raised because __str__ must return a string.
   • BBook: Python Basics
   • CPython Basics
   • D<__main__.Book object at 0x...>
   Reveal Solution Discussion Select an answer first