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This code defines a Flask blueprint named greetings which handles two routes: /hello and /goodbye.

Blueprint Definition:

• greetings = Blueprint('greetings', __name__) creates a blueprint object named greetings associated with the current module (__name__). Blueprints provide a way to structure Flask applications into modular components.

Route Handlers:

• @greetings.route('/hello') defines a route handler for the /hello endpoint.

• def hello(): defines the function that will be executed when the /hello route is accessed.

• return 'Hello there!' returns the greeting message “Hello there!” as a string.

• @greetings.route('/goodbye') defines a route handler for the /goodbye endpoint.

• def goodbye(): defines the function that will be executed when the /goodbye route is accessed.

• return 'Goodbye!' returns the goodbye message “Goodbye!” as a string.

Function Documentation:

• Each function (hello, goodbye) includes docstrings that describe the function’s purpose and return type. These are helpful for documentation and code comprehension.

Usage:

This blueprint would be registered with a Flask app to make the routes accessible. Once registered, you could access the routes using URLs like /greetings/hello and /greetings/goodbye (assuming the blueprint is registered under the /greetings URL prefix).

Key Points:

• This code demonstrates the use of Flask blueprints for organizing code and defining routes.
• Each route is associated with a specific function that handles the request.
• Docstrings are used to provide documentation for the functions.
• The blueprint would typically be registered with a Flask app to make the routes available.