oop-solid-design-patterns/problem4_strategy.py at main · khadijafatima409/oop-solid-design-patterns · GitHub

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"""
Problem 4: Strategy Pattern
"""

from abc import ABC, abstractmethod


class PaymentStrategy(ABC):
    @abstractmethod
    def process_payment(self, amount): pass


class CreditCardStrategy(PaymentStrategy):
    def process_payment(self, amount):
        print(f"Paid {amount} via Credit Card")


class PayPalStrategy(PaymentStrategy):
    def process_payment(self, amount):
        print(f"Paid {amount} via PayPal")


class BankTransferStrategy(PaymentStrategy):
    def process_payment(self, amount):
        print(f"Paid {amount} via Bank Transfer")


class PaymentProcessor:
    def __init__(self, strategy: PaymentStrategy):
        self.strategy = strategy

    def set_strategy(self, strategy: PaymentStrategy):
        self.strategy = strategy

    def execute_payment(self, amount):
        self.strategy.process_payment(amount)


if __name__ == "__main__":
    processor = PaymentProcessor(CreditCardStrategy())
    processor.execute_payment(100)

    processor.set_strategy(PayPalStrategy())
    processor.execute_payment(200)

    processor.set_strategy(BankTransferStrategy())
    processor.execute_payment(300)