Created
November 14, 2022 12:20
-
-
Save Bloofer/b5a49813d674f3315a4a80f8d6a3a6bf to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
from abc import ABC, abstractmethod | |
from collections import namedtuple | |
Customer = namedtuple('Customer', 'named fidelity') | |
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): | |
return | |
class FidelityPromo(Promotion): | |
def discount(self, order): | |
return order.total() * .05 if order.customer.fidelity >= 1000 else 0 | |
class BulkItemPromo(Promotion): | |
def discount(self, order): | |
discount = 0 | |
for item in order.cart: | |
if item.quantity >= 20: | |
discount += item.total() * .1 | |
return discount | |
class LargeOrderPromo(Promotion): | |
def discount(self, order): | |
distinct_items = {item.product for item in order.cart} | |
if len(distinct_items) >= 10: | |
return order.total() * .07 | |
return 0 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment