Python Coding challenge - Day 1001| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class Task:

A class named Task is defined.

This class will both:

have a normal method (do)

be callable because it defines __call__.

2. Defining Method do

    def do(self):

        self.do = Task()

        return "step1"

This method performs two actions:

Replaces itself on the instance

self.do = Task()

Creates an instance attribute named do.

This instance attribute overrides (shadows) the class method do.

The new value is a Task object.

Returns a string

return "step1"

3. Defining __call__

    def __call__(self):

        return "step2"

__call__ makes Task objects callable.

Any Task instance can be executed like a function:

Task()() → "step2"

 4. Creating an Instance

t = Task()

An object t of class Task is created.

Initially:

t.do → class method

5. First Call: t.do()

t.do()

Step-by-step:

Python finds do as a class method.

Executes the method.

Inside the method:

self.do = Task() creates an instance attribute.

The method returns "step1".

Result of first call:

"step1"

After this call:

t.do → Task()   # callable object

6. Second Call: t.do()

t.do()

Step-by-step:

Python looks for do on the instance t.

Finds the instance attribute (Task() object).

Since it is callable, Python executes:

t.do.__call__()

__call__ returns "step2".

Result of second call:

"step2"

7. Printing the Results

print(t.do(), t.do())

First t.do() → "step1"

Second t.do() → "step2"

8. Final Output

step1 step2

Final Answer

✔ Output:

step1 step2

900 Days Python Coding Challenges with Explanation