Classes and Objects in Python

21

The assignment of more than one function to a particular operator is . . . . . . . .

A) Operator over-assignment B) Operator overriding C) Operator overloading D) Operator instance

Discuss

Answer & Solution

Answer: Option C

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22

What is the difference between a class variable and an instance variable in Python?

A) A class variable is shared among all instances of a class, while an instance variable is unique to each instance B) They are the same C) An instance variable is shared among all instances D) A class variable is unique to each instance

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Answer & Solution

Answer: Option A

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23

How can you access a class variable in Python?

A) Using the class name and dot notation B) Using the self keyword C) Using the cls keyword D) Using the object keyword

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Answer & Solution

Answer: Option A

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24

. . . . . . . . represents an entity in the real world with its identity and behaviour.

A) A method B) An object C) A class D) An operator

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Answer & Solution

Answer: Option B

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25

. . . . . . . . is used to create an object.

A) class B) constructor C) User-defined functions D) In-built functions

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Answer & Solution

Answer: Option B

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26

What are the methods which begin and end with two underscore characters called?

A) Special methods B) In-built methods C) User-defined methods D) Additional methods

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Answer & Solution

Answer: Option A

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27

What is setattr() used for?

A) To access the attribute of the object B) To set an attribute C) To check if an attribute exists or not D) To delete an attribute

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Answer & Solution

Answer: Option B

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28

What is getattr() used for?

A) To access the attribute of the object B) To delete an attribute C) To check if an attribute exists or not D) To set an attribute

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Answer & Solution

Answer: Option A

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29

What is the output of the following code:

class MyClass:
 x = 5
obj = MyClass()
print(obj.x)

A) 5 B) An error will occur C) obj D) MyClass

Discuss

Answer & Solution

Answer: Option C

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30

What is the output of the following code:

class Parent:
 def show(self):
 print('Parent method')
class Child(Parent):
 pass
obj = Child()
obj.show()

A) Parent method B) An error will occur C) Child method D) obj

Discuss

Answer & Solution

Answer: Option A

Solution:

The correct answer is A: Parent method

Here's why:

We have a class called `Parent` that has a method named `show`. This method prints "Parent method".

Then, we create another class called `Child` that inherits from the `Parent` class. This means the `Child` class automatically gets all the methods and attributes of the `Parent` class.

Importantly, the `Child` class doesn't define its own `show` method. It inherits the `show` method directly from `Parent`.

We create an object of the `Child` class called `obj`.

When we call `obj.show()`, Python looks for a `show` method in the `Child` class. Since it doesn't find one there, it looks in the `Parent` class (because `Child` inherits from `Parent`).

It finds the `show` method in the `Parent` class and executes it. Therefore, it prints "Parent method".