# -*- coding: UTF-8 -*-
from discount import DiscountPerItems, DiscountPerValue, NoDiscountAtAll
class DiscountCalculator(object):
def calculate(self, budget):
discounter = DiscountPerItems(DiscountPerValue(NoDiscountAtAll()))
return discounter.apply(budget)
if __name__ == '__main__':
from models import Budget, Item
budget = Budget()
budget.add(Item('Item A', 100.0))
budget.add(Item('Item B', 50.0))
budget.add(Item('Item C', 400.0))
calculator = DiscountCalculator()
discount = calculator.calculate(budget)
print('Discount applied: %s' % (discount))
# -*- coding: UTF-8 -*-
# State is a behavioral design pattern that lets an
# object alter its behavior when its internal state
# changes. It appears as if the object changed its class.
from models import Budget, Item
if __name__ == '__main__':
budget = Budget()
budget.add(Item('Car', 100.0))
budget.add(Item('Laundry', 50.0))
budget.add(Item('Cake', 400))
print(budget.amount)
print(budget.status)
budget.approve() # or budget.disapprove()
print(budget.status)
budget.apply_bonus()
print(budget.amount)
budget.finish()
print(budget.status)