# 商品類
class Goods(object):
 def __init__(self,name,price,stock):
 self.id = 0
 self.name = name
 self.price = price
 self.stock = stock
 # 當(dāng)打印對(duì)象時(shí)，輸出的內(nèi)容
 def __str__(self):
 return 'id:%s\n' \
  '名稱:%s\n' \
  '價(jià)格:%s\n' \
  '庫(kù)存:%s\n' % (self.id,self.name,self.price,
    self.stock)
 
 
if __name__ == '__main__':
 goods = Goods('Apple pods',2999,100)
 print(goods)
 goods2 = Goods('Apple Watch',3666,100)
 print(goods2)

from goods import Goods
 
class CartItem(object):
 # 購(gòu)物車商品
 def __init__(self,goods,count):
 self.goods = goods
 self.count = count
 
 def __str__(self):
 # %f是小數(shù)類型的占位符
 return '%s(￥%.2f)*%s' % (self.goods.name,
     self.goods.price,self.count)
 
 # 計(jì)算商品小計(jì)
 def amout(self):
 return self.goods.price * self.count
 
 
if __name__ == '__main__':
 goods = Goods('Apple pods',2999,100)
 # 創(chuàng)建購(gòu)物車商品對(duì)象，需要傳入一個(gè)商品對(duì)象
 item = CartItem(goods,2)
 money = item.amout()
 print(money)

from goods import Goods
from cart import CartItem
 
class Shop(object):
 """商店"""
 def __init__(self):
 # 存儲(chǔ)所有商品
 self.shops = []
 # 存儲(chǔ)購(gòu)物車商品
 self.cart = []
 # 加載商品
 self.load()
 
 def load(self):
 """加載商品"""
 self.add(Goods('Apple Watch', 3299, 100))
 self.add(Goods('AirPods', 1288, 100))
 self.add(Goods('Home Pod', 1299, 100))
 self.add(Goods('iPhone X', 6288, 100))
 
 def add(self, good):
 """
 設(shè)置新商品的id，添加到列表中
 :param good: 新商品
 :return: None
 """
 good.id = len(self.shops) + 1
 self.shops.append(good)
 
 def print_line(self):
 
 print('-'*50)
 
 def print_double_line(self):
 print('='*50)
 
 def list(self):
 """列出所有商品"""
 print('請(qǐng)選擇商品：')
 self.print_double_line()
 # 遍歷商品列表
 for g in self.shops:
 
  print('%s %s %s' % (g.id, g.name, g.price))
  self.print_line()
 
 def list_cart(self):
 """展示購(gòu)物車商品，計(jì)算總價(jià)"""
 self.print_line()
 total = 0.0
 for item in self.cart:
  print('%s =￥%s' % (item, item.amout()))
  total += item.amout()
 self.print_line()
 print('總金額：￥%.2f' % total)
 
 def add_to_cart(self):
 """添加商品到購(gòu)物車"""
 print('\n')
 g_id = input('請(qǐng)輸入商品Id（回車去結(jié)賬，0清空購(gòu)物車）：')
 
 if len(g_id) == 0:
  # 結(jié)賬
  total = 0.0
  for item in self.cart:
 
  total += item.amout()
  self.print_line()
  print('請(qǐng)支付：￥%.2f' % total)
 
  # 清空購(gòu)物車
  self.cart.clear()
  print('支付成功！')
 
 elif g_id == '0':
  self.cart.clear()
  print('購(gòu)物車已清空！')
 else:
  # 計(jì)算商品索引
  idx = int(g_id) - 1
  # 取出商品
  goods = self.shops[idx]
  self.print_line()
  print(goods)
 
  count = int(input('請(qǐng)輸入購(gòu)買數(shù)量：'))
  # 判斷數(shù)量是否大于庫(kù)存量
  while count > goods.stock:
  count = int(input('沒(méi)有這么多商品，請(qǐng)重新輸入：'))
 
  # 如果商品已經(jīng)在購(gòu)物車中，修改商品數(shù)量
  # 變量表示在購(gòu)物車中是否有這個(gè)商品
  is_exsts = False
  for item in self.cart:
  if item.goods == goods:
   # 說(shuō)明在購(gòu)物車中有該商品
   is_exsts = True
   item.count += count
   # 減少庫(kù)存
   goods.stock -= count
 
  # 如果執(zhí)行到這，is_exsts的值還是False，說(shuō)明購(gòu)物車中沒(méi)有該商品
  if is_exsts == False:
  # 把商品添加到購(gòu)物車
  goods.stock -= count
  self.cart.append(CartItem(goods, count))
 
  # 展示購(gòu)物車商品，計(jì)算總價(jià)
  self.list_cart()
 
 def run(self):
 """運(yùn)行應(yīng)用程序"""
 print('智游電子產(chǎn)品商店')
 print('v1.0')
 print('\n')
 
 self.list()
 
 while True:
  self.add_to_cart()
 
shop = Shop()
shop.run()