[Solved] What is the main issue in this Flask code that breaks the pattern and causes an error?from flask import Flask, Blueprint bp = Blueprint('bp', __name__) @bp.route('/test') def test():... | Flask

Flask - Ecosystem and Patterns

What is the main issue in this Flask code that breaks the pattern and causes an error?

from flask import Flask, Blueprint

bp = Blueprint('bp', __name__)

@bp.route('/test')
def test():
    return 'Test page'

app = Flask(__name__)

if __name__ == '__main__':
    app.run()

ABlueprint is not registered with the Flask app

BRoute decorator syntax is incorrect

CFunction test() is missing a return statement

DFlask app is not created properly

Step-by-Step Solution

Solution:

Step 1: Check Blueprint usage
The Blueprint 'bp' is defined with a route but never registered to the app.
Step 2: Understand effect of missing registration
Without registering, Flask does not know about the Blueprint routes, causing 404 errors.
Final Answer:
Blueprint is not registered with the Flask app -> Option A
Quick Check:
Missing Blueprint registration causes route errors = B [OK]

Quick Trick: Always register Blueprints with app [OK]

Common Mistakes:

MISTAKES

Assuming Blueprint auto-registers
Misreading route decorator syntax
Ignoring missing return statements

Master "Ecosystem and Patterns" in Flask

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Perf

More Flask Quizzes

What is the main issue in this Flask code that breaks the pattern and causes an error?

Step 1: Check Blueprint usage

Step 2: Understand effect of missing registration

Final Answer:

Quick Check:

Want More Practice?