Exercise: Encapsulation

Questions for: Encapsulation

Consider the following Python code: 
class Car:
    def __init__(self, model, speed):
        self._model = model
        self._speed = speed

    def display_info(self):
        return f"Model: {self._model}, Speed: {self._speed} km/h"
What encapsulation concept is demonstrated in this code?
A:
Public access specifier
B:
Private access specifier
C:
Protected access specifier
D:
Global variable
Answer: B
The single underscore prefix (_) in the variables _model and _speed indicates that they are private variables, demonstrating encapsulation by hiding the implementation details.
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Which of the following access specifiers in Python allows a variable or method to be accessible within its own class and its subclasses?
A:
Public
B:
Private
C:
Protected
D:
Global
Answer: C
The protected access specifier in Python allows a variable or method to be accessible within its own class and its subclasses.
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Which of the following statements is true regarding encapsulation?
A:
It encourages exposing all internal details of an object.
B:
It is achieved through the use of global variables.
C:
It involves combining data and methods into a single unit and hiding implementation details.
D:
It promotes code complexity by making all variables public.
Answer: C
Encapsulation in Python involves combining data and methods into a single unit and hiding implementation details.
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What is the primary purpose of using encapsulation in object-oriented programming?
A:
To expose all implementation details of an object
B:
To hide the implementation details of an object and bundle data and methods into a single unit
C:
To create global variables for easy access
D:
To increase code complexity
Answer: B
The primary purpose of encapsulation is to hide the implementation details of an object and bundle data and methods into a single unit.
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In Python, what is the purpose of the @property decorator in a class?
A:
To create a new instance of a class
B:
To provide a getter method for a private variable
C:
To define a private variable
D:
To access a global variable
Answer: B
The @property decorator is used in Python to create a getter method for a private variable, allowing controlled access.
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