[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'

AOnly 'Task done' printed, no 'Hello'

BBoth 'Hello' and 'Task done' printed at the same time synchronously

CHello printed immediately, then 'Task done' printed asynchronously

DNo output printed because thread is not started

Step-by-Step Solution

Solution:

Step 1: Understand threading in Flask route
The route starts a background thread that prints 'Task done' asynchronously.
Step 2: Identify response behavior
The route returns 'Hello' immediately without waiting for the thread.
Final Answer:
'Hello' printed immediately, then 'Task done' printed asynchronously -> Option C
Quick Check:
Threaded task prints later, response returns immediately [OK]

Quick Trick: Thread starts async, response returns immediately [OK]

Common Mistakes:

MISTAKES

Expecting 'Task done' before 'Hello'
Thinking thread blocks response
Assuming no output because thread is ignored

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More Flask Quizzes

Given this Flask code snippet, what will be printed?

Step 1: Understand threading in Flask route

Step 2: Identify response behavior

Final Answer:

Quick Check:

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