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Promotion.py
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71 lines (51 loc) · 1.84 KB
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from abc import ABC, abstractmethod
from collections import namedtuple
Customer = namedtuple('Customer', 'name fildelity')
class LineItem:
def __init__(self, product, quantity, price):
self.product = product
self.quantity = quantity
self.price = price
def total(self):
return self.price * self.quantity
class Order:
def __init__(self, customer, cart, promotion=None):
self.customer = customer
self.cart = list(cart)
self.promotion = promotion
def total(self):
if not hasattr(self, '__total'):
self.__total = sum(item.total() for item in self.cart)
return self.__total
def due(self):
if self.promotion is None:
discount = 0
else:
discount = self.promotion.discount(self)
return self.total() - discount
def __repr__(self):
fmt = '<Order total: {:.2f} due: {:.2f}>'
return fmt.format(self.total(), self.due())
class Promotion(ABC):
@abstractmethod
def discount(self, order):
'''返回折扣金额 （正值）'''
class FidelityPromo(Promotion):
'''为积分为1000或以上的顾客提供5%折扣'''
def discount(self, order):
return order.total() * .05 if order.customer.fidelity >= 1000 else 0
class BulkItemPromo(Promotion):
'''单个商品为20个或以上时提供10%折扣'''
def discout(self, order):
discount = 0
for item in order.cart:
if item.quantity >= 20:
discount += item.total() * .1
return discount
class LargeOrderPromo(Promotion):
'''订单中的不同商品达到10个或以上时提供7%折扣'''
def discount(self, order):
distinct_items = {item.product for item in order.cart}
if len(distinct_items) >= 10:
return order.total * .07
return 0