Python Coding challenge - Day 1111| What is the output of the following Python Code?

 

Code Explanation:

1️⃣ Importing Threading Module

import threading

Explanation

Imports Python’s built-in threading module.

Used to create and manage threads.

2️⃣ Defining Task Function

def task():

    print("X")

Explanation

A function task is defined.

This will run inside a thread.

It simply prints:

X

3️⃣ Creating a Thread Object

t = threading.Thread(target=task)

Explanation

A thread t is created.

target=task means:

When thread runs → it executes task().

4️⃣ Starting the Thread (First Time)

t.start()

Explanation

Starts execution of the thread.

Internally calls:

task()

👉 Output:

X

5️⃣ Waiting for Thread to Finish

t.join()

Explanation

Main thread waits until thread t completes.

Ensures thread has fully finished execution.

6️⃣ Starting the Same Thread Again ❌

t.start()

Explanation ⚠️ IMPORTANT

You are trying to restart the same thread object.

This is NOT allowed in Python.

👉 A thread can be started only once.

❌ What Happens?

Python raises an error:

RuntimeError: threads can only be started once

📤 Final Output

X

RuntimeError

Book: 900 Days Python Coding Challenges with Explanation