timmy a révisé ce gist 10 months ago. Aller à la révision
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timmy a révisé ce gist 10 months ago. Aller à la révision
Aucun changement
timmy a révisé ce gist 1 year ago. Aller à la révision
1 file changed, 39 insertions
pricing_strategy_normal_discount_shopping_cart.py(fichier créé)
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| 1 | + | from abc import ABC, abstractmethod | |
| 2 | + | ||
| 3 | + | # 策略介面 | |
| 4 | + | class PricingStrategy(ABC): | |
| 5 | + | @abstractmethod | |
| 6 | + | def calculate_price(self, price): | |
| 7 | + | pass | |
| 8 | + | ||
| 9 | + | # 具體策略類 | |
| 10 | + | class NormalStrategy(PricingStrategy): | |
| 11 | + | def calculate_price(self, price): | |
| 12 | + | return price | |
| 13 | + | ||
| 14 | + | class DiscountStrategy(PricingStrategy): | |
| 15 | + | def __init__(self, discount_rate): | |
| 16 | + | self.discount_rate = discount_rate | |
| 17 | + | ||
| 18 | + | def calculate_price(self, price): | |
| 19 | + | return price * (1 - self.discount_rate) | |
| 20 | + | ||
| 21 | + | # 上下文類 | |
| 22 | + | class ShoppingCart: | |
| 23 | + | def __init__(self, pricing_strategy): | |
| 24 | + | self.pricing_strategy = pricing_strategy | |
| 25 | + | ||
| 26 | + | def set_pricing_strategy(self, pricing_strategy): | |
| 27 | + | self.pricing_strategy = pricing_strategy | |
| 28 | + | ||
| 29 | + | def checkout(self, items): | |
| 30 | + | total_price = sum(items) | |
| 31 | + | return self.pricing_strategy.calculate_price(total_price) | |
| 32 | + | ||
| 33 | + | # 使用範例 | |
| 34 | + | cart = ShoppingCart(NormalStrategy()) | |
| 35 | + | items = [100, 200, 300] | |
| 36 | + | print("Total price with normal strategy:", cart.checkout(items)) # Output: Total price with normal strategy: 600 | |
| 37 | + | ||
| 38 | + | cart.set_pricing_strategy(DiscountStrategy(0.2)) | |
| 39 | + | print("Total price with discount strategy:", cart.checkout(items)) # Output: Total price with discount strategy: 480 | |
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