'''
购物车程序
1.启动程序后，让用户输入工资，然后打印商品列表
2.允许用户根据商品编号购买商品
3.用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒
4.可随时退出，退出时，打印已购买商品和余额
'''
#!/usr/bin/env python
goods_list=[
('cloth',200),
('rice',80),
('coffee',25),
('software',25000),
('computer',10000),
('TVGames',300),
]
shopping_list=[]
salary = input("your salary is:")
if salary.isdigit():
salary = int(salary)
while True:
for index,intem in enumerate(goods_list):
print(index,intem)
UserChoice = input ("your choice is:")
if UserChoice.isdigit():
UserChoice = int(UserChoice)
if UserChoice <len(goods_list) and UserChoice>=0:
p_item = goods_list[UserChoice]
if p_item[1]<=salary:
shopping_list.append(p_item)
salary -= p_item[1]
print("Add %s into shopping card, your current balance is %s"%(p_item,salary))
else:
print("your balance is %s not enough to buy goods" %(salary))
else:
print("goods code[%s] is not exist"%(UserChoice))
elif UserChoice=='q':
print("---shopping_list---")
for p in shopping_list:
print(p)
print("your current balance is ",salary)
exit()
else:
print("invalid option")
