购物车程序

购物车程序需求:

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

product_list = [

    ('Iphone',5800),

    ('Mac Pro',9800),

    ('Bike',800),

    ('Watch',10600),

    ('Coffee',31),

    ('Alex Python',120),

]

shopping_list = []

salary = input("Input your salary:")

if salary.isdigit():        #判断输入的是否是数字,与值是str无关

  salary = int(salary)

while True:

for index,item in enumerate(product_list):

#对于一个可迭代、可遍历的对象(如列表、字符串),enumerate将其组成一个索引序列,利用它可以同时获取索引和值

#print(product_list.index(item),item)

print(index,item)

user_choice = input("选择要买嘛?输入q退出!>>>:")

if user_choice.isdigit():

user_choice = int(user_choice)

if user_choice in range(len(product_list)):

p_item = product_list[user_choice]

if p_item[1] <= salary: #买的起

shopping_list.append(p_item)

salary -= p_item[1]

print("Added %s into shopping cart,your current balance is \033[31;1m%s\033[0m" %(p_item,salary) )

else:

print("\033[41;1m你的余额只剩[%s]啦,还买个毛线\033[0m" % salary)

else:

print("product code [%s] is not exist!"% user_choice)

elif user_choice == 'q':

print("--------shopping list------")

for p in shopping_list:

print(p)

print("Your current balance:",salary)

exit()

else:

print("invalid option")

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