Flask-Caching for response caching - Mini Project: Build & Apply

Flask-Caching for response caching

📖 Scenario: You are building a simple Flask web app that shows the current time. To make it faster and reduce server load, you want to cache the response for 10 seconds so repeated visits within that time show the cached time instead of recalculating.

🎯 Goal: Create a Flask app with a route /time that returns the current time. Use Flask-Caching to cache the response for 10 seconds.

📋 What You'll Learn

Create a Flask app instance named app

Set up Flask-Caching with a simple cache type

Create a route /time that returns the current time as a string

Cache the /time route response for 10 seconds using Flask-Caching

💡 Why This Matters

🌍 Real World

Caching responses in web apps improves speed and reduces server load, especially for data that doesn't change often.

💼 Career

Many web developer roles require knowledge of caching techniques to optimize app performance and scalability.

1

Set up the Flask app and import modules

Import Flask from flask and create a Flask app instance called app.

Flask

from flask import Flask

# Create the Flask app instance called app
# Your code here

Need a hint?

Use app = Flask(__name__) to create the app instance.

2

Configure Flask-Caching

Import Cache from flask_caching. Create a Cache instance called cache and initialize it with app using the simple cache type.

Flask

from flask import Flask
from flask_caching import Cache

app = Flask(__name__)

# Create Cache instance and initialize with app using simple cache
# Your code here

Need a hint?

Use Cache(app, config={'CACHE_TYPE': 'SimpleCache'}) to set up caching.

3

Create the /time route with caching

Import datetime from datetime. Create a route /time using @app.route('/time'). Use @cache.cached(timeout=10) decorator to cache the response for 10 seconds. Inside the function time(), return the current time as a string using datetime.now().strftime('%H:%M:%S').

Flask

from flask import Flask
from flask_caching import Cache
from datetime import datetime

app = Flask(__name__)

cache = Cache(app, config={'CACHE_TYPE': 'SimpleCache'})

# Create /time route with caching for 10 seconds
# Your code here

Need a hint?

Use @cache.cached(timeout=10) above the route function to cache the response for 10 seconds.

4

Add the app run block

Add the standard Flask app run block: if __name__ == '__main__': and inside it call app.run(debug=True).

Flask

from flask import Flask
from flask_caching import Cache
from datetime import datetime

app = Flask(__name__)

cache = Cache(app, config={'CACHE_TYPE': 'SimpleCache'})

@app.route('/time')
@cache.cached(timeout=10)
def time():
    return datetime.now().strftime('%H:%M:%S')

# Add the app run block below
# Your code here

Need a hint?

This block runs the app when you execute the script directly.