Static folder configuration in Flask - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the URL to access a static file?

Given a Flask app with the default static folder named 'static', what URL path will serve the file located at static/images/logo.png?

Flask

from flask import Flask
app = Flask(__name__)

# File located at static/images/logo.png

@app.route('/')
def home():
    return 'Home Page'

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

A /static/images/logo.png

B /images/logo.png

C /static/logo.png

D /assets/images/logo.png

💡 Hint

Flask serves static files from the folder named 'static' by default under the '/static' URL prefix.

By default, Flask serves files inside the 'static' folder under the URL path '/static'. So a file at 'static/images/logo.png' is accessed via '/static/images/logo.png'.

📝 Syntax

intermediate

How to change the static folder name in Flask?

Which code snippet correctly changes the static folder from the default 'static' to 'assets' in a Flask app?

A app = Flask(__name__, static_folder='/assets')

B app = Flask(__name__, static_folder='assets')

C app = Flask(__name__, static_url_path='assets')

D app = Flask(__name__, static_path='assets')

💡 Hint

The parameter to set the folder name is 'static_folder'.

To change the folder where Flask looks for static files, use the static_folder parameter when creating the Flask app.

🔧 Debug

advanced

Why does Flask not serve static files from a custom folder?

A developer sets app = Flask(__name__, static_folder='public') but accessing /public/style.css returns 404. What is the cause?

A The static_url_path must be set to '/public' to match the folder name.

B The URL path to static files is still '/static' by default, but the folder is 'public', so the URL should be '/public/style.css'.

C Flask requires the static folder to be named 'static' and cannot be changed.

D The static_folder parameter must be an absolute path, not a relative one.

💡 Hint

Changing the folder does not change the URL path unless you also set static_url_path.

When you change the static folder to 'public', Flask still serves static files under '/static' URL by default. To serve files under '/public', you must set static_url_path='/public'.

❓ state_output

advanced

What is the value of static_url_path after app creation?

Given app = Flask(__name__, static_folder='assets', static_url_path='/content'), what is the value of app.static_url_path?

Flask

from flask import Flask
app = Flask(__name__, static_folder='assets', static_url_path='/content')
print(app.static_url_path)

A /assets

B /

C /static

D /content

💡 Hint

static_url_path sets the URL prefix for static files.

The static_url_path parameter sets the URL prefix for static files. Here it is '/content'.

🧠 Conceptual

expert

Why use a custom static_url_path in Flask?

Which reason best explains why a developer might set a custom static_url_path different from the default '/static'?

A Because Flask requires a custom static_url_path for production environments.

B To make Flask serve static files faster by changing the URL path.

C To avoid URL conflicts with other routes or external services using '/static'.

D To automatically compress static files when served.

💡 Hint

Think about URL naming conflicts in web apps.

Changing static_url_path helps avoid conflicts if another route or external service uses '/static'. It does not affect performance or compression.