Basic Flask Application

This section demonstrates a fundamental "hello world" application using the Flask microframework in Python. It's a common starting point for learning web development with Flask.

from flask import Flask

app = Flask(__name__)

@app.route('/', methods=['GET'])
def home():
    return 'hello world'
  
if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000, debug=False)

Understanding the Code

Flask Initialization

The line app = Flask(__name__) initializes a new Flask application instance. The __name__ argument helps Flask determine the root path of the application.

Defining a Route

The @app.route('/', methods=['GET']) decorator registers the home function to handle requests to the root URL ('/') using the GET method. When a user visits the root of the web server, this function will be executed.

Route Handler Function

The home() function is a simple Python function that returns the string 'hello world'. This string will be displayed in the user's browser.

Running the Application

The if __name__ == '__main__': block ensures that the app.run() method is called only when the script is executed directly (not imported as a module). app.run(host='0.0.0.0', port=5000, debug=False) starts the development server, making the application accessible on your local network.

Further Learning

To expand your knowledge of Flask, consider exploring:

• Flask Quickstart Documentation
• MDN Web Docs: HTTP GET Request
• Official Python Documentation