Flask Introduction 🎯

Welcome to your first lesson on Flask! In this tutorial, we'll learn about Flask, a popular Python web framework that makes it easy to build web applications. By the end of this tutorial, you'll be able to create your own simple web applications using Flask.

What is Flask? 📝

Flask is a micro web framework for Python that provides a simple and easy-to-use API for building web applications. It's perfect for beginners and small-scale projects, but also powerful enough for larger applications.

Why use Flask? 💡

Easy to learn: Flask has a simple and clean syntax that's easy to understand.
Flexible: Flask allows you to build web applications quickly and easily, with a lot of flexibility.
Pythonic: Flask is built using Python, so it's easy to integrate with other Python libraries and tools.

Installing Flask ✅

Before we dive into the tutorial, let's make sure you have Flask installed on your computer. To install Flask, open your terminal and run the following command:

bash

pip install flask

Your First Flask Application 🎯

Now that you have Flask installed, let's create your first Flask application. In your terminal, create a new directory for your project and navigate into it:

bash

mkdir my_flask_app
cd my_flask_app

Next, create a new file called app.py and open it in your favorite text editor:

bash

touch app.py
nano app.py

Now, let's add some code to app.py that will create a simple web application. Here's what it should look like:

python

# app.py
from flask import Flask
app = Flask(__name__)

@app.route('/')
def home():
    return "Hello, World!"

if __name__ == '__main__':
    app.run(debug=True)

This code creates a new Flask application, defines a route for the homepage, and starts the server. Save the file and go back to your terminal. Run the following command to start the server:

bash

python app.py

Now, open a web browser and go to http://127.0.0.1:5000/. You should see the message "Hello, World!" displayed on the page. Congratulations! You've created your first Flask application!

Next Steps 💡

In the next lesson, we'll learn about views, templates, and how to handle user input.

Stay tuned and happy coding! 😊