Python Coding challenge - Day 985| What is the output of the following Python Code?

 

Code Explanation:

1. Defining Class A

class A:

    def f(self): return "A"

Class A defines a method f.

f() returns the string "A".

2. Defining Class B

class B:

    def f(self): return "B"

Class B also defines a method f.

f() returns the string "B".

3. Defining Class C Inheriting from A

class C(A): pass

Class C inherits from A.

At this point, the inheritance chain is:

C → A → object

4. Creating an Object of C

obj = C()

An instance obj of class C is created.

At this moment:

obj.f() → "A"

5. Changing the Base Class at Runtime

C.__bases__ = (B,)

This line modifies the inheritance of class C at runtime.

Now, C no longer inherits from A, but from B.

The new inheritance chain becomes:

C → B → object

Important:

This change affects all instances of C, including ones already created.

6. Calling f() After Base Change

print(obj.f())

Step-by-step method lookup:

Python looks for f in class C → not found.

Python looks in B (new base class) → found.

B.f() is called.

7. Final Output

B

Final Answer

✔ Output:

B

100 Python Programs for Beginner with explanation