Tell us what’s happening:
Step 27
My code is:
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):
discounted = strategy.apply_discount(product)
prices.add(discounted)
I get the error message:
Sorry, your code does not pass. Don't give up.
If a strategy is applicable, you should call apply_discount and append the result to pri
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):
discounted = strategy.apply_discount(product)
prices.add(discounted)
# 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