[Solved] Identify the error in this Flask code snippet for running a background task: from threading import Thread def background_task(): print('Running') @app.route('/') def index():... | Flask

Flask - Background Tasks

Identify the error in this Flask code snippet for running a background task:

from threading import Thread

def background_task():
    print('Running')

@app.route('/')
def index():
    Thread(target=background_task()).start()
    return 'Done'

AThread class cannot be used in Flask apps.

BThe target argument should be the function name without parentheses.

CThe print statement is invalid inside threads.

DThe route function must return None.

Step-by-Step Solution

Solution:

Step 1: Check Thread target usage
Thread target expects a function reference, not a function call.
Step 2: Identify the mistake
Using background_task() calls the function immediately, passing its result instead of the function.
Final Answer:
The target argument should be the function name without parentheses. -> Option B
Quick Check:
Thread target = function name, no parentheses [OK]

Quick Trick: Pass function name to Thread target, no parentheses [OK]

Common Mistakes:

MISTAKES

Calling function instead of passing reference
Thinking Thread can't be used in Flask
Believing print is invalid in threads

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More Flask Quizzes

Identify the error in this Flask code snippet for running a background task:

Step 1: Check Thread target usage

Step 2: Identify the mistake

Final Answer:

Quick Check:

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