How to Implement the Observer Pattern in Python

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How to Implement the Observer Pattern in Python
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Have you ever wondered how YouTube notifies you when your favorite channel uploads a new video. Or how your email client alerts you when new messages arrive. These are perfect examples of the observer pattern in action. The observer pattern is a design pattern where an object (called the subject) maintains a list of dependents (called observers) and notifies them automatically when its state changes. It's like having a newsletter subscription: when new content is published, all subscribers get notified...

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