Python Coding challenge - Day 1003| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class Count:

A class named Count is defined.

2. Defining a Class Variable

    x = 1

x is a class variable.

It belongs to the class Count, not to any specific object.

Initially:

Count.x == 1

3. Defining the Method inc

    def inc(self):

        self.x += 1

This line is the key trap.

self.x += 1 is equivalent to:

self.x = self.x + 1

Python first reads self.x:

It does not find x in the instance.

So it reads Count.x (value = 1).

Then it assigns back to self.x:

This creates a new instance variable x on that object.

4. Creating Two Objects

c1 = Count()

c2 = Count()

Two separate instances are created.

At this point:

c1.__dict__ == {}

c2.__dict__ == {}

Count.x == 1

5. Calling inc() on c1

c1.inc()

Step-by-step:

self.x → Python reads Count.x → 1

Adds 1 → result 2

Assigns back to instance:

c1.x = 2

After this:

c1.__dict__ == {'x': 2}

c2.__dict__ == {}

Count.x == 1

6. Printing the Values

print(c1.x, c2.x)

c1.x → instance variable → 2

c2.x → no instance variable → falls back to class variable → 1

7. Final Output

2 1

✅ Final Answer

✔ Output:

2 1

400 Days Python Coding Challenges with Explanation