IndiaBIX

Python Programming - Encapsulation

Exercise : Encapsulation - General Questions
  • Encapsulation - General Questions
91.
What is the primary purpose of the following Python class? 
class Student:
    def __init__(self, name, __grade):
        self.name = name
        self.__grade = __grade

    def get_grade(self):
        return self.__grade
To create a new instance of the class
To provide controlled access to the 'grade' variable
To define a public variable 'grade'
To allow unrestricted access to the 'grade' variable
Answer: Option
Explanation:
The get_grade() method provides controlled and read-only access to the private variable '__grade', demonstrating encapsulation.
92.
How can encapsulation be enforced in Python to make a variable 'employee_id' accessible only within its own class? 
class Employee:
    def __init__(self, employee_id, __salary):
        self.employee_id = employee_id
        self.__salary = __salary
Use a getter method for 'employee_id'
Add a single underscore prefix before 'employee_id'
Make 'employee_id' a global variable
Add a double underscore prefix before 'employee_id'
Answer: Option
Explanation:
Adding a double underscore prefix before 'employee_id' makes it a private variable, enforcing encapsulation within the class.
93.
Consider the following Python code: 
class Rectangle:
    def __init__(self, __length, __width):
        self.__length = __length
        self.__width = __width

    def calculate_area(self):
        return self.__length * self.__width
What is the purpose of the calculate_area() method?
To retrieve the area of the rectangle
To set a new area for the rectangle
To calculate the area of the rectangle
To expose all internal details of the class
Answer: Option
Explanation:
The calculate_area() method calculates and returns the area of the rectangle, demonstrating encapsulation.
94.
In Python, what is the benefit of using a private variable with a double underscore prefix, such as __inventory_count? 
class Product:
    __inventory_count = 0

    def update_inventory(self, count):
        Product.__inventory_count += count
It improves code maintainability by hiding implementation details
It allows unrestricted access to __inventory_count
It exposes all internal details of __inventory_count
It creates a global variable
Answer: Option
Explanation:
Encapsulation with a double underscore prefix improves code maintainability by hiding the implementation details of the class attribute __inventory_count.
95.
What is the primary purpose of the following Python class? 
class Car:
    def __init__(self, model, __speed):
        self.model = model
        self.__speed = __speed

    def get_speed(self):
        return self.__speed
To create a new instance of the class
To provide controlled access to the 'speed' variable
To define a public variable 'speed'
To allow unrestricted access to the 'speed' variable
Answer: Option
Explanation:
The get_speed() method provides controlled and read-only access to the private variable '__speed', demonstrating encapsulation.
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers