First Flask App

Welcome to the exciting world of Flask, a micro web framework written in Python! In this lesson, we'll guide you through creating your first Flask app. 🎯

What is Flask?

Flask is a lightweight and easy-to-use web framework for Python. It allows you to quickly develop web applications without the complexity of larger frameworks. 📝

Prerequisites

Before we dive in, make sure you have:

Python installed on your system
Basic understanding of Python syntax

Setting Up Your First Flask App

Install Flask using pip:

bash

pip install flask

Creating Your First Flask App

Now let's create a simple Flask app that serves a "Hello, World!" message.

python

from flask import Flask

app = Flask(__name__)

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

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

📝 Note: Each Flask app starts with creating a new Flask web server. The __name__ == '__main__' checks if the script is being run directly (not imported as a module) and starts the server.

Running Your Flask App

Save the code above in a file named app.py and run it:

bash

python app.py

Now open your browser and visit http://localhost:5000/. You should see "Hello, World!" displayed. 🎉

Next Steps

In the next part of this tutorial, we'll explore more about Flask routes, handling user inputs, and connecting to databases. Stay tuned! 💡