39. Strategy Pattern

The Strategy pattern allows selecting an algorithm at runtime.

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Example

class Strategy:
    def execute(self, data): pass

class UpperCase(Strategy):
    def execute(self, data): return data.upper()

class LowerCase(Strategy):
    def execute(self, data): return data.lower()

def process(strategy, text):
    return strategy.execute(text)

print(process(UpperCase(), "Hello"))

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Wrap-Up

Strategy makes it easy to switch behaviors dynamically.