Environment-based configuration in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to load the configuration from an environment variable.

Flask

app.config.from_envvar('[1]')

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

ACONFIG_PATH

Bconfig.py

CENV_CONFIG

DAPP_SETTINGS

Attempts:

3 left

💡 Hint

Common Mistakes

Using a file name instead of an environment variable name.

Confusing environment variable names with config file names.

The from_envvar method loads configuration from the file path stored in the environment variable. Here, CONFIG_PATH is the environment variable name.

2fill in blank

medium

Complete the code to set the Flask app configuration from a Python object based on the environment variable.

Flask

app.config.from_object('[1]')

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

Aos.environ.get('FLASK_ENV')

Bconfig.ProductionConfig

Cconfig.DevelopmentConfig

Dconfig.TestingConfig

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the environment variable value directly instead of a config class path.

Using the environment variable getter instead of a config class.

The from_object method loads configuration from a Python object. Here, config.ProductionConfig is a typical class used for production settings.

3fill in blank

hard

Fix the error in the code to correctly load configuration from environment variables using Flask's config.from_mapping.

Flask

app.config.from_mapping({ 'DEBUG': [1] })

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

Aos.environ.get('DEBUG') == 'True'

Bos.environ['DEBUG']

Cos.getenv('DEBUG')

Dos.getenv('DEBUG', False)

Attempts:

3 left

💡 Hint

Common Mistakes

Using os.getenv without converting to boolean.

Using os.environ which raises error if variable missing.

Environment variables are strings. To set DEBUG as a boolean, compare the string to 'True'.

4fill in blank

hard

Fill both blanks to create a config dictionary that sets SECRET_KEY and DATABASE_URL from environment variables.

Flask

config = { 'SECRET_KEY': [1], 'DATABASE_URL': [2] }

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

Aos.environ.get('SECRET_KEY')

Bos.getenv('DATABASE_URL')

Cos.environ['DATABASE_URL']

Dos.getenv('SECRET_KEY')

Attempts:

3 left

💡 Hint

Common Mistakes

Using os.environ which raises KeyError if variable missing.

Mixing up environment variable names.

Use os.environ.get or os.getenv to safely get environment variables for config values.

5fill in blank

hard

Fill all three blanks to load configuration from a file path stored in an environment variable, then override with a dictionary from environment variables.

Flask

app.config.from_pyfile([1])
app.config.update({ 'DEBUG': [2], 'TESTING': [3] })

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

Aos.environ['CONFIG_FILE']

Bos.getenv('DEBUG') == 'True'

Cos.getenv('TESTING') == 'True'

Dos.environ.get('CONFIG_FILE')

Attempts:

3 left

💡 Hint

Common Mistakes

Using os.getenv for config file path which may be None.

Not converting string flags to booleans.

Use os.environ['CONFIG_FILE'] to get the config file path (raises error if missing). Then convert string environment variables to booleans for DEBUG and TESTING.