Configuration management in Flask - Mini Project: Build & Apply

Flask Configuration Management

📖 Scenario: You are building a simple Flask web app that needs to manage different settings for development and production environments.

🎯 Goal: Create a Flask app that loads configuration from a dictionary, uses a config variable to select the environment, and applies the correct settings.

📋 What You'll Learn

Create a dictionary called configurations with two keys: development and production, each holding a dictionary of settings.

Add a variable called current_env to select the environment as a string.

Use the current_env variable to load the correct configuration into the Flask app's config.

Add a route / that returns the current environment and a config value.

💡 Why This Matters

🌍 Real World

Managing different settings for development, testing, and production environments is common in real web apps to avoid mistakes and improve security.

💼 Career

Understanding Flask configuration management is essential for backend web developers to build scalable and maintainable applications.

1

Create configuration dictionary

Create a dictionary called configurations with two keys: 'development' and 'production'. Each key should map to a dictionary with these exact entries: 'DEBUG': True for development and 'DEBUG': False for production.

Flask

# Your code here

Need a hint?

Use a dictionary with two keys and nested dictionaries as values.

2

Add environment selector variable

Add a variable called current_env and set it to the string 'development'.

Flask

configurations = {
    'development': {'DEBUG': True},
    'production': {'DEBUG': False}
}
# Your code here

Need a hint?

Just assign the string 'development' to current_env.

3

Load configuration into Flask app

Create a Flask app instance called app. Then load the configuration from configurations[current_env] into app.config using app.config.from_mapping().

Flask

configurations = {
    'development': {'DEBUG': True},
    'production': {'DEBUG': False}
}

current_env = 'development'

from flask import Flask
# Your code here

Need a hint?

Use Flask(__name__) to create the app and from_mapping() to load config.

4

Add route to show current config

Add a route / to the app that returns a string showing the current environment and the value of DEBUG from app.config. Use a function called index and return a string formatted as f"Environment: {current_env}, Debug: {app.config['DEBUG']}".

Flask

configurations = {
    'development': {'DEBUG': True},
    'production': {'DEBUG': False}
}

current_env = 'development'

from flask import Flask
app = Flask(__name__)
app.config.from_mapping(configurations[current_env])

# Your code here

Need a hint?

Use the @app.route('/') decorator and a function that returns the formatted string.