#author devilf
product_list = [
('iphone',5800),
('Mac Pro',9800),
('Bike',800),
('Watch',10000),
('Coffee',123)
]
shop_list = []
salary = input('pls enter your salary: ')
if salary.isdigit(): #判断是否为整形，否则会退出
salary = int(salary)
while True:
for index,info in enumerate(product_list): #打印列表
# print(product_list.index(info),info)
print(index,info)
user_choice = input('pls enter what you buy\n>>>: ') #输入要购买的商品 编号
if user_choice.isdigit(): #再判断下输入的是否是数字，否则退出
user_choice = int(user_choice)
if user_choice <= len(product_list) and user_choice >= 0: #判断输入的编号是否在商品列表的编号范围内
p_item = product_list[user_choice] #取出编号对应的商品名称
if p_item[1] <= salary: #判断改商品的价格是否在工资范围内
shop_list.append(p_item) #如果在工资范围内，购买！
salary -= p_item[1] #总工资便会减少对应的钱
print('Added %s into shopping cart,your current balance is %s' %(p_item,salary))
else:
print('your current balance is %s ,now is not enough' % (salary))
else:
print('product %s is not exist!' % user_choice )
elif user_choice == 'q': #如果输入的是 'q'，便会退出
print('-------------shopping list------------')
for p in shop_list:
print(p)
print('quit.....,your current money: ',salary)
exit()
else:
print('Invalid option')
