Quiz 05 - Python Objects

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1. What is a class in in Python?

• a) A variable that holds data

• b) A template for creating objects

• c) A built-in function

• d) A type of loop

Answer explanation

A class in Python is a blueprint for creating objects, defining their properties and behaviors. It allows for encapsulation and reusability of code, making option b) the correct choice.

2. Which method is automatically called when an object is created?

• a) __del__

• b) __main__

• c) __init__

• d) __str__

Answer explanation

The __init__ method is a constructor in Python, automatically called when an object is created. It initializes the object's attributes. Other options like __del__ and __str__ serve different purposes and are not called upon object creation.

3. What does self represent in a class method?

• a) The parent class

• b) The instance of the class

• c) A reserved keyword for inheritance

• d) A reference to the class itself

Answer explanation

In a class method, 'self' represents the instance of the class. It allows access to the instance's attributes and methods, distinguishing it from other instances and the class itself.

4. Which keyword is used to inherit from a parent class?

• a) extends

• b) inherit

• c) super

• d) Parentheses in the class definition

Answer explanation

In Python, inheritance is indicated by placing the parent class name in parentheses in the class definition. This allows the child class to inherit attributes and methods from the parent class.

5. What is the output of the code below? print(type([]))

• a)

• b)

• c)

• d)

Answer explanation

The code prints the type of an empty list, represented by []. In Python, this is classified as a 'list', so the output is , making option b) the correct answer.

6. Which statement about instance attributes is true?

• a) They are shared across all instances of a class.

• b) They are defined outside the __init__ method.

• c) They are unique to each object.

• d) They cannot be modified after creation.

Answer explanation

Instance attributes are unique to each object, meaning each instance of a class can have different values for these attributes. This distinguishes them from class attributes, which are shared across all instances.

7. What does the dir(obj) function return?

• a) The documentation string of obj

• b) A list of obj’s attributes and methods

• c) The memory address of obj

• d) The parent class of obj

Answer explanation

The dir(obj) function returns a list of the attributes and methods of the object 'obj'. This helps in understanding what operations can be performed on the object, making option b) the correct choice.

8. Which code correctly creates an instance of a class Dog?

• a) Dog.create()

• b) Dog.__init__()

• c) Dog()

• d) new Dog()

Answer explanation

The correct way to create an instance of a class in Python is by calling the class name followed by parentheses. Therefore, 'Dog()' correctly creates an instance of the Dog class, while the other options are incorrect.