How to Create a Flask Development Server

Flask is a popular web framework for building web applications in Python. In this article, we will walk through the process of creating a development server using Flask.

Step 1: Install Flask

First, you need to install Flask on your local machine. You can do this using pip, the Python package manager, by running the following command in your terminal:

pip install flask

Step 2: Create a Flask App

Next, you need to create a new Python file for your Flask app. You can name this file anything you like, but for this example, let’s call it app.py. In this file, you will define your Flask app and its routes.

from flask import Flask
app = Flask(__name__)

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

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

Step 3: Run the Development Server

Once you have created your Flask app, you can run the development server by executing the following command in your terminal:

python app.py

This will start the Flask development server on your local machine. You can now access your Flask app by visiting http://localhost:5000 in your web browser.

Conclusion

Creating a development server with Flask is a quick and easy process. With just a few simple steps, you can have a Flask app up and running on your local machine in no time. Happy coding!