Python Design Patterns: Factory, Singleton, Observer

Short summary

A practical tutorial covering three core Python design patterns: Factory, Singleton, and Observer. Factory isolates object creation logic to keep code extensible; Singleton enforces a single instance for shared resources like database connections; Observer enables event-driven communication between objects. Each pattern includes code examples and use-case guidance for when to apply them.

• •Factory pattern decouples object creation from usage, avoiding if/else spaghetti
• •Singleton guarantees one instance for shared resources like config or DB connections
• •Observer pattern enables event-driven systems where objects react to state changes

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