Quick Answer
Python design patterns: Singleton (module-level instance), Factory (function that returns different types based on input), Strategy (pass different functions/callables), Observer (callbacks list or signal library), Decorator (functools.wraps), Iterator (yield), Context Manager (__enter__/__exit__), Dependency Injection (pass dependencies as arguments). Python's first-class functions simplify many patterns.
Answer
Singleton, Factory, Observer, Strategy, Decorator. Provide modularity, scalability, and maintainability. Applied in complex architecture and large systems.
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Verified Answer
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