Python Coding challenge - Day 1039| What is the output of the following Python Code?

 

Code Explanation:

1. Defining Class A

class A:

Creates a base class named A

Inherits from object implicitly

🔹 2. Overriding __new__ in Class A

def __new__(cls):

    print("A new")

    return super().__new__(cls)

What __new__ does:

__new__ is responsible for creating the object

It runs before __init__

cls refers to the class being instantiated (here: B)

Line-by-line:

print("A new") → prints a message when an object is created

super().__new__(cls) → actually creates and returns the object

⚠️ If this line didn’t return an object, __init__ would never run

🔹 3. Defining Class B (Inherits from A)

class B(A):

B inherits from A

B does not override __new__

So A.__new__ is used when creating a B object

🔹 4. Defining Constructor __init__ in Class B

def __init__(self):

    print("B init")

__init__ initializes an already-created object

Runs after __new__, but only if __new__ returns an object

self refers to the instance of B

🔹 5. Creating an Object of B

B()

Execution order:

Python looks for __new__

Not found in B

Found in A → A.__new__ runs

"A new" is printed

super().__new__(cls) creates the object

Python calls B.__init__

"B init" is printed

✅ Final Output

A new

B init

700 Days Python Coding Challenges with Explanation