Python Coding challenge - Day 1012| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the first parent class

class One:

    def f(self): return "one"

This defines a class One.

It has a method f() that returns the string "one".

2. Defining the second parent class

class Two:

    def f(self): return "two"

This defines another class Two.

It also has a method f(), but it returns "two".

3. Defining the child class

class Test(One): pass

Test is a subclass of One.

It does not define any methods of its own.

Initially, Test inherits f() from One.

4. Creating an instance

t = Test()

An object t of class Test is created.

At this moment, t.f() would return "one".

5. Changing the base class dynamically

Test.__bases__ = (Two,)

__bases__ is a special attribute that stores a class’s parent classes.

This line replaces One with Two as the base class of Test.

Now:

class Test(Two): ...

This change affects all existing and future instances of Test.

6. Calling the method

print(t.f())

Python looks for f() using the Method Resolution Order (MRO):

Test

Two

f() is found in Two.

So "two" is returned.

✅ Final Output

two

400 Days Python Coding Challenges with Explanation