Python Coding challenge - Day 1155| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Class Definition

class Test:

✅ Explanation:

A class named Test is created.

Inside this class:

A class variable x

A constructor __init__

are defined.

🔹 2. Class Variable Creation

x = []

✅ Explanation:

x is a class variable

It belongs to the class itself, NOT individual objects.

⚠️ Important:

This list is shared by ALL objects of the class.

🔹 3. Constructor Definition

def __init__(self, value):

✅ Explanation:

Constructor runs whenever object is created.

value receives value passed during object creation.

🔹 4. Appending Value

self.x.append(value)

✅ Explanation:

self.x first searches:

Instance variable

Then class variable

Since object has no own x,

Python uses class variable:

Test.x

🔹 5. Creating First Object

a = Test(1)

🔍 What happens:

Constructor runs:

self.x.append(1)

Class list becomes:

[1]

🔹 6. Creating Second Object

b = Test(2)

🔍 What happens:

Again constructor runs:

self.x.append(2)

Since same class list is used:

[1, 2]

🔹 7. Printing Values

print(a.x, b.x)

✅ Explanation:

Both:

a.x

b.x

point to SAME class variable.

So both print:

[1, 2]

🎯 Final Output

[1, 2] [1, 2]

Book: 500 Days Python Coding Challenges with Explanation