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Python Programming - Objects

Exercise : Objects - General Questions
  • Objects - General Questions
11.
Consider the following Python code: 
class Rectangle:
    def __init__(self, length, width):
        self.length = length
        self.width = width

    def calculate_perimeter(self):
        return 2 * (self.length + self.width)
If you create an instance of the `Rectangle` class called `my_rectangle` with length 4 and width 6, what will be the result of calling my_rectangle.calculate_perimeter()?
10
20
24
30
Answer: Option
Explanation:
The calculate_perimeter method calculates the perimeter of the rectangle using the formula 2 * (length + width). For the given instance, it would be 2 * (4 + 6) = 24.
12.
What is the primary purpose of the __str__ method in Python classes?
To create a string representation of the object
To compare objects for equality
To initialize the object's attributes
To perform object serialization
Answer: Option
Explanation:
The __str__ method is used to define the string representation of an object. It is automatically called when the str() function is invoked on the object.
13.
Consider the following Python code: 
class BankAccount:
    def __init__(self, balance):
        self.balance = balance

    def deposit(self, amount):
        self.balance += amount
        return self.balance
If you create an instance of the `BankAccount` class called my_account with an initial balance of 100 and then call my_account.deposit(50), what will be the updated balance?
150
100
50
None
Answer: Option
Explanation:
The deposit method adds the specified amount to the balance. In this case, it would be 100 + 50 = 150.
14.
In Python, what is the purpose of the __del__ method in a class?
To create a new instance of the class
To destroy the class object
To define class attributes
To delete a specific attribute
Answer: Option
Explanation:
The __del__ method is called when an object is about to be destroyed. It can be used to perform cleanup operations before the object is deleted.
15.
Consider the following Python code: 
class Temperature:
    def __init__(self, celsius):
        self.celsius = celsius

    def to_fahrenheit(self):
        return (self.celsius * 9/5) + 32
If you create an instance of the `Temperature` class called my_temp with a Celsius value of 25 and then call my_temp.to_fahrenheit(), what will be the result?
32
77
25
57.2
Answer: Option
Explanation:
The to_fahrenheit method converts Celsius to Fahrenheit using the formula (Celsius * 9/5) + 32. For the given instance, it would be (25 * 9/5) + 32 = 77.
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