Introduction

Flask is a micro web framework for Python that allows you to quickly create web applications. In this guide, we'll walk you through the process of creating your first Flask web application from scratch. By the end, you'll have a basic understanding of how Flask works and a simple web application up and running.

Step 1: Install Flask

The first step is to install Flask. You can install Flask using pip, the Python package manager. Open your terminal or command prompt and run the following command:

pip install Flask
        

Step 2: Create Your Flask Application

Now, let's create a basic Flask application. You can use any text editor or integrated development environment (IDE) to create your Python files. Here's a simple example:

from flask import Flask
app = Flask(__name)
@app.route('/')
def hello():
    return "Hello, Flask!"
if __name__ == '__main__':
    app.run()
        

This code creates a Flask web application with a single route (@app.route('/')) that responds with "Hello, Flask!" when you visit the root URL.

Step 3: Running Your Application

To run your Flask application, open your terminal, navigate to the directory where your Python file is located, and run the following command:

python your_app.py
        

Your Flask application should now be running, and you can access it in your web browser at http://localhost:5000.

Conclusion

Congratulations! You've created your first Flask web application. Flask makes it easy to get started with web development in Python. This is just the beginning, and you can explore more complex applications and features as you become more familiar with Flask.