A messaging pattern where senders of messages, called publishers, do not program the messages to be sent directly to specific receivers, called subscribers, but instead categorize published messages into classes without knowledge of which subscribers, if any, there may be.
A YouTube channel uploads a video (Publish). Millions of subscribers get a notification (Subscribe).
# Code Concept for Publisher–Subscriber\n# This pattern is architectural.\n\nclass Service:\n def execute(self):\n # Implementation logic\n pass