Development server with debug mode in Flask - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of running a Flask development server with debug mode enabled?

Debug mode helps developers by automatically reloading the server on code changes and showing detailed error messages in the browser.

beginner

How do you enable debug mode when running a Flask app?

You can enable debug mode by setting app.debug = True or by running app.run(debug=True).

beginner

What happens if you do not use debug mode during development?

Without debug mode, the server won't reload automatically on code changes, and error messages will be less detailed, making debugging harder.

intermediate

Why should debug mode never be used in production?

Debug mode can expose sensitive information and allow code execution from the browser, which is a security risk in production.

beginner

What is the Flask command to start the development server with debug mode from the terminal?

You can run flask run --debug to start the server with debug mode enabled.

What does Flask's debug mode do?

A Makes the app run faster

B Disables the server

C Automatically reloads the server on code changes and shows detailed errors

D Encrypts all data sent to the server

Debug mode helps by reloading the server when code changes and showing detailed error messages.

How can you enable debug mode when calling app.run()?

A <code>app.run(debug=True)</code>

B <code>app.run(debug=False)</code>

C <code>app.run(mode='debug')</code>

D <code>app.run(enable_debug)</code>

Passing debug=True to app.run() enables debug mode.

Why should you avoid using debug mode in production?

A It prevents users from accessing the app

B It slows down the server

C It disables logging

D It exposes sensitive information and security risks

Debug mode can expose sensitive info and allow code execution, which is unsafe in production.

Which command starts Flask with debug mode from the terminal?

A flask run --debug

B flask start debug

C python app.py debug

D flask debug start

The correct command is flask run --debug.

What is a benefit of Flask's debug mode during development?

A It hides all error messages

B It automatically reloads the app when you save changes

C It disables the server

D It compresses your code

Debug mode reloads the app automatically when code changes are saved.

Explain how to enable and use debug mode in a Flask development server.

Think about the app.run() method and what debug mode helps with.

Why is it important to avoid using debug mode in a production environment?

Consider what debug mode shows that could be dangerous.