Debug mode error pages in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable debug mode in a Flask app.

Flask

from flask import Flask
app = Flask(__name__)
app.run(debug=[1])

Drag options to blanks, or click blank then click option'

A1

BTrue

C"yes"

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string like "yes" instead of a boolean True.

Setting debug to False disables debug mode.

Setting debug=True enables debug mode in Flask, which shows detailed error pages.

2fill in blank

medium

Complete the code to define a route that triggers an error for testing debug pages.

Flask

@app.route('/error')
def error():
    return 1 / [1]

Drag options to blanks, or click blank then click option'

ANone

B"0"

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 or None which do not cause errors.

Using a string "0" which causes a different error.

Dividing by zero (1 / 0) raises an error to test debug error pages.

3fill in blank

hard

Fix the error in the code to properly enable debug mode when running the Flask app.

Flask

if __name__ == '__main__':
    app.run([1]=True)

Drag options to blanks, or click blank then click option'

Adebug

Bdebug_mode

Crun_debug

Dmode_debug

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect parameter names like debug_mode or run_debug.

Forgetting to set debug to True.

The correct parameter to enable debug mode in app.run() is debug.

4fill in blank

hard

Fill both blanks to create a custom error handler for 404 errors that shows a debug message.

Flask

@app.errorhandler([1])
def not_found(error):
    return "Error [2]: Page not found", 404

Drag options to blanks, or click blank then click option'

A404

B500

C403

D400

Attempts:

3 left

💡 Hint

Common Mistakes

Using other error codes like 500 or 403 which mean different errors.

Mismatching error codes in decorator and return statement.

The error code for 'Not Found' is 404, so both blanks should be 404.

5fill in blank

hard

Fill all three blanks to log errors and show debug info when an exception occurs.

Flask

import logging

@app.errorhandler([1])
def handle_exception(e):
    logging.[2](f"Error occurred: {e}")
    return "Debug info: " + str(e), [3]

Drag options to blanks, or click blank then click option'

AException

Berror

C500

Dexception

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'exception' as the error type instead of Exception.

Using logging.error instead of logging.exception for full traceback.

Returning wrong HTTP status codes.

Use Exception to catch all errors, logging.exception to log with traceback, and return HTTP status 500 for server errors.