Python Coding challenge - Day 876| What is the output of the following Python Code?

 

Code Explanation:

1. Define base class A

class A:

    v = 5

This creates a class named A.

v is a class attribute of A with value 5.

Class attributes are shared by the class and — unless overridden — by its instances.

2. Define subclass B that inherits A

class B(A):

This creates a class B that inherits from A.

Because of inheritance, B has access to A's attributes and methods (unless overridden).

3. Override class attribute v in B

    v = 12

B defines its own class attribute v with value 12.

This shadows (overrides) the v from A for references that resolve through B or its instances (i.e., B.v or self.v inside B).

4. Define instance method show in B

    def show(self):

        return self.v + A.v

show(self) is an instance method of B.

self.v looks up v starting from the instance’s class (B) and finds B.v == 12.

A.v explicitly references the class attribute v defined on A (which is 5), bypassing the normal lookup.

The expression self.v + A.v therefore computes 12 + 5.

5. Create an instance of B

b = B()

Instantiates an object b of type B.

No __init__ defined, so default construction occurs; b can access class attributes/methods.

6. Call show() and print the result

print(b.show())

b.show() executes the show method on the b instance.

As explained, it returns 12 + 5 = 17.

print outputs:

17

Final Output

17

700 Days Python Coding Challenges with Explanation