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class PayPalPaymentGateway(PaymentGateway): def process_payment(self, amount): print(f"Processing payment of ${amount} using PayPal.")
stripe_gateway = StripePaymentGateway() paypal_gateway = PayPalPaymentGateway()
class StripePaymentGateway(PaymentGateway): def process_payment(self, amount): print(f"Processing payment of ${amount} using Stripe.")
class Rectangle(Shape): def __init__(self, width, height): self.width = width self.height = height
def area(self): return self.width * self.height
class PayPalPaymentGateway(PaymentGateway): def process_payment(self, amount): print(f"Processing payment of ${amount} using PayPal.")
stripe_gateway = StripePaymentGateway() paypal_gateway = PayPalPaymentGateway()
class StripePaymentGateway(PaymentGateway): def process_payment(self, amount): print(f"Processing payment of ${amount} using Stripe.")
class Rectangle(Shape): def __init__(self, width, height): self.width = width self.height = height
def area(self): return self.width * self.height
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