[Solved] Given this Flask code snippet, what will be printed? from threading import Thread from flask import Flask app = Flask(__name__) def... Given this Flask code snippet, what will be printed? | Flask

Flask - Background Tasks

Given this Flask code snippet, what will be printed?

from threading import Thread
from flask import Flask
app = Flask(__name__)
def background_task():
    print('Task done')
@app.route('/')
def index():
    Thread(target=background_task).start()
    return 'Hello'

AHello printed immediately, then 'Task done' printed later

BOnly 'Hello' is printed, 'Task done' never prints

CBoth 'Hello' and 'Task done' print at the same time

DSyntaxError because Thread is used incorrectly

Step-by-Step Solution

Solution:

Step 1: Understand thread behavior in Flask route
The route starts a thread to run background_task, then returns 'Hello' immediately.
Step 2: Predict output order
'Hello' is sent to user right away; 'Task done' prints later when thread runs.
Final Answer:
Hello printed immediately, then 'Task done' printed later -> Option A
Quick Check:
Thread runs task after response = A [OK]

Quick Trick: Thread runs task after response, so print order differs [OK]

Common Mistakes:

MISTAKES

Thinking 'Task done' prints before 'Hello'
Assuming thread blocks response
Believing thread syntax is wrong here

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More Flask Quizzes

Given this Flask code snippet, what will be printed?

Step 1: Understand thread behavior in Flask route

Step 2: Predict output order

Final Answer:

Quick Check:

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