python3点餐系统实例代码

#coding UTF-8
# version = version_1_2
 
today_menu = ["今天菜单如下","1 宫保鸡丁","2 青椒鸡米粒" ,"3 白萝卜焖肉", "4 蒜薹腊肉", "5 豆腐包肉 ",
 "6 鲤鱼跃龙门", "7 凉拌莲藕", "8 红烧南瓜", "9 大白菜", "10 青菜", "11 荷包蛋(另加２元）", "12 蛋炒饭(10元)"]
price =[0,0,12,0,0 ,10 ,13,0,9,11,14,0,10,0,15,0]

 
def getTodayMenu():
 return today_menu
def showTodayMenu(interable):
 for today_menu_details in today_menu :
  print(today_menu_details)
 
def showCombineNote():
 print("提示：一荤一素10，两素菜9元，一荤两素11，，三素菜10，两荤菜12，两荤一素13，两荤两素14，两荤三素15元")
 print("请输入您点餐的编号，编号之间用逗号分开，不同份数之间用空格隔开\n例如输入1,9,10 2,6,8 3,10,谢谢 : ")
 
def dealWithUserInput():
 user_choise = input() 
 
 user_choise_list = user_choise.split()
 
 price_total = 0#用price_total来记录所点菜的总和
 price_one = 0#用来计算每一份菜的价格
 choosed_list = []
 pay_total = 0 #用来保存优惠后需要支付的价格
 
 for one_order in user_choise_list :
  count_i = count_j =0 #count_i用来保存素菜的个数　　count_j用来保存混菜的个数
  hebaodan = 0#用来记录荷包蛋的个数
  danchaofan = 0#用来记录蛋炒饭的个数
  one_order_list = one_order.split(",")#one_order_list 保存的是["1","9","10]
  for menu_item in one_order_list :#menu_item　就是保存的单个的数字
   #首先得防止用户输入的不是数字，是数字则处理，不是则提示用户重新输入
   if menu_item.strip().isdigit(): 
    #这里防止用户输入的时候跟预期的不一样，可能多了一些空格，所以需要去掉空格后转化为数字
    if int(menu_item.strip()) <7: 
     count_j += 1
    elif int(menu_item.strip()) <11:
     count_i += 1
    elif int(menu_item.strip()) == 11:
     hebaodan += 1
    elif int(menu_item.strip()) == 12:
     danchaofan += 1
    choosed_list.append(int(menu_item))
   else:
    print("您输入的有非数字类型，请重新运行程序，谢谢")
    exit()
   choosed_list.append(0)
  
  #如果是正确的组合，则price[count_i*4 + count_j]是不会为０的，但是输入一个数字代表特色菜品的时候也是可行的
  #两种组合都不是的时候就证明不是正确的组合，程序退出
  if price[count_i*4 + count_j] ==0 and "12" not in one_order: 
   print("您输入的不是一个正确的组合，请重新运行程序，　谢谢")
   exit()
  else:
   price_one= price[count_i*4 + count_j] + hebaodan *2 + danchaofan * 10
  price_total += price_one
 
 #根据计算得到的总需要支付的价格，判断享受哪种优惠，得出优惠后的价格
 if price_total >=30:
  pay_total = price_total - 4
  
 elif price_total >=26:
  pay_total = price_total - 3
 
 elif price_total >=20:
  pay_total = price_total - 2
 else:
  pay_total = price_total
 
 print("您预订了 %d 份美食，具体如下: " % len(user_choise_list))
 
 for choosed_item in choosed_list :
  if choosed_item == 0:
   print()
  else:
   print(today_menu[choosed_item])
 print("您共需要支付 %d 元,谢谢" % pay_total)
 
print("欢迎进入点餐系统")
 
today_menu = getTodayMenu()
showTodayMenu(today_menu)
showCombineNote()
dealWithUserInput()