from babel.messages import Catalog
my_catalog = Catalog(locale='en_US')
my_catalog.add('Hello, World!', 'Bonjour, Monde!', auto_comments=['Greeting'])
hello_world_msg = my_catalog.get('Hello, World!')This retrieves the translation message with the original text "Hello, World!" from the catalog, which can then be used to display the translated text in the appropriate place in the application. In conclusion, the Babel package library is a set of tools for localization and translation in Python. The babel.messages.catalog Catalog is one of these tools, used for organizing, storing, and manipulating translation messages in a project. The examples above demonstrate how to create a new catalog, add messages to it, and retrieve messages from it, using the Catalog class.