flask how to run app

from flask import Flask

# Create a Flask application
app = Flask(__name__)

# Define a route and its corresponding function
def hello():
    return 'Hello, World!'

# Run the Flask application
if __name__ == '__main__':
  1. Import the Flask class from the flask module.
  2. Create a Flask application instance by initializing app = Flask(__name__).
  3. Define a route using the @app.route() decorator. In this example, the route '/' represents the root URL.
  4. Define a function that will be executed when the defined route is accessed. This function returns the string 'Hello, World!'.
  5. Start the Flask application by using app.run(debug=True). This method runs the application on a development server.
  6. The condition if __name__ == '__main__': ensures that the app is executed only if it's run directly, not if it's imported as a module in another file.