Python Coding challenge - Day 1157| 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 data is defined.

🔹 2. Class Variable Creation

data = {}

✅ Explanation:

data is a class variable

It belongs to the class itself, not individual objects.

⚠️ Important:

This dictionary is shared among ALL objects of the class.

🔹 3. Creating First Object

a = Test()

✅ Explanation:

Creates object a of class Test.

At this point:

a.data → {}

But this is actually:

Test.data

🔹 4. Creating Second Object

b = Test()

✅ Explanation:

Creates another object b.

Again:

b.data

points to same class dictionary.

🔹 5. Modifying Dictionary Using a

a.data["x"] = 1

✅ Explanation:

Adds key-value pair:

"x": 1

to shared dictionary.

Now class variable becomes:

{"x": 1}

🔹 6. Why b.data Also Changes

Since:

a.data

b.data

both refer to SAME dictionary:

Test.data

So changes made through a

are visible through b.

🔹 7. Printing b.data

print(b.data)

✅ Output:

{'x': 1}

🎯 Final Output

{'x': 1}

500 Days Python Coding Challenges with Explanation