[Solved] Identify the error in this Flask app factory code using an extension:from flask import Flask from flask_mail import Mail mail = Mail() def create_app(): app = Flask(__name__) mail = Mail(app) mail.... | Flask

Flask - Middleware and Extensions

Identify the error in this Flask app factory code using an extension:

from flask import Flask
from flask_mail import Mail

mail = Mail()

def create_app():
    app = Flask(__name__)
    mail = Mail(app)
    mail.init_app(app)
    return app

ARe-creating the Mail instance inside the factory causes multiple instances.

BCalling init_app after passing app to constructor is redundant but not an error.

CMissing app creation before Mail instance.

DNo error, code is correct.

Step-by-Step Solution

Solution:

Step 1: Check extension instance creation
The extension instance is created globally, but then recreated inside the factory, which is incorrect.
Step 2: Understand consequences
Re-creating inside factory causes multiple instances and breaks the pattern.
Final Answer:
Re-creating the Mail instance inside the factory causes multiple instances. -> Option A
Quick Check:
Multiple extension instances = Re-creating the Mail instance inside the factory causes multiple instances. [OK]

Quick Trick: Create extension once globally, don't recreate inside factory [OK]

Common Mistakes:

MISTAKES

Recreating extension inside factory
Calling init_app redundantly
Ignoring instance duplication issues

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Identify the error in this Flask app factory code using an extension:

Step 1: Check extension instance creation

Step 2: Understand consequences

Final Answer:

Quick Check:

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