Flask - Ecosystem and Patterns
Which code snippet correctly implements a Flask application factory function?
Which code snippet correctly implements a Flask application factory function?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify factory function
The factory function should create and return a new Flask app instance.Step 2: Analyze options
def create_app(): app = Flask(__name__) return app defines create_app() that creates and returns a Flask app correctly.Step 3: Eliminate incorrect options
app = Flask(__name__) def create_app(): return app creates app outside the function, not a factory. def create_app(app): app = Flask(__name__) return app has an unused parameter and reassigns app. def create_app(): return Flask returns the Flask class, not an instance.Final Answer:
def create_app(): app = Flask(__name__) return app -> Option AQuick Check:
Function creates and returns app instance? Yes. [OK]
Quick Trick: Factory must create and return new app instance [OK]
Common Mistakes:
MISTAKES- Defining app globally instead of inside factory
- Returning Flask class instead of instance
- Including unnecessary parameters in factory
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