Build a Discount Calculator - Step 27

Python
1

Tell us what’s happening:

I am stuck with this error even though the code seems correct

If a strategy is applicable, you should call apply_discount and append the result to prices.

Your code so far

from abc import ABC, abstractmethod
from typing import List

class Product:
    def __init__(self, name: str, price: float) -> None:
        self.name = name
        self.price = price

    def __str__(self) -> str:
        return f'{self.name} - ${self.price}'

class DiscountStrategy(ABC):
    @abstractmethod
    def is_applicable(self, product: Product, user_tier: str) -> bool:
        pass

    @abstractmethod
    def apply_discount(self, product: Product) -> float:
        pass

class PercentageDiscount(DiscountStrategy):
    def __init__(self, percent: int) -> None:
        self.percent = percent

    def is_applicable(self, product: Product, user_tier: str) -> bool:
        return self.percent <= 70

    def apply_discount(self, product: Product) -> float:
        return product.price * (1 - self.percent / 100)

class FixedAmountDiscount(DiscountStrategy):
    def __init__(self, amount: int) -> None:
        self.amount = amount

    def is_applicable(self, product: Product, user_tier: str) -> bool:
        return product.price * 0.9 > self.amount

    def apply_discount(self, product: Product) -> float:
        return product.price - self.amount

class PremiumUserDiscount(DiscountStrategy):
    def is_applicable(self, product: Product, user_tier: str) -> bool:
        return user_tier.lower() == 'premium'

    def apply_discount(self, product: Product) -> float:
        return product.price * 0.8

class DiscountEngine:
    def __init__(self, strategies: List[DiscountStrategy]) -> None:
        self.strategies = strategies


# User Editable Region

    def calculate_best_price(self, product: Product, user_tier: str) -> float:
        prices = [product.price]
        for strategy in self.strategies:
            if strategy.is_applicable(product, user_tier):
                prices.append(strategy.apply_discount(product))


# User Editable Region

product = Product('Wireless Mouse', 50.0)
print(product)

discount = PercentageDiscount(10)
print(discount.apply_discount(product))

fixed_discount = FixedAmountDiscount(5)
print(fixed_discount.apply_discount(product))

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Challenge Information:

Build a Discount Calculator - Step 27

2

Hi @NotchyCookiez

… and store it in a variable named discounted.

Happy coding