韦大仙python--购物车

程序：购物车程序

需求:

启动程序后，让用户输入工资，然后打印商品列表
允许用户根据商品编号购买商品
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
可随时退出，退出时，打印已购买商品和余额

!/usr/bin/env python

-- coding:utf-8 --

username=lhl,password=123456

auth:lhl

print("-------------欢迎登入xx购物广场------------")
usename=input("请输入您的用户名:")
pwd=input("请输入您的密码：")
if usename'lhl' and pwd'123456':
with open('info.txt','r',encoding='utf-8') as f,
open('price.txt','r',encoding='utf-8') as p:
p=p.read()
f=f.read()
print('#################购物清单###############')
print('%s'%f ,'剩余金额:%s'%p)
product_list=[
('iphone',5800),
('mac pro',9800),
('bike',800),
('watch',10600),
('coffee',31),
('python-book',85)
]
shoping_list=[]
salary=input("input your salary:")
if salary.isdigit():
salary=int(salary)
while True:
for index,item in enumerate(product_list):
print(index,item)
user_choice=input("选择商品>>：")
if user_choice.isdigit():
user_choice=int(user_choice)
if user_choice <len(product_list) and user_choice >=0:
p_item=product_list[user_choice]
if p_item[1] <=salary:
shoping_list.append(p_item)
salary-=p_item[1]
print('添加 %s 到您的购物车,你的余额是：33[0;31m%s33[0m '%(p_item,salary))
else:
print('你的余额还剩 33[0;31m%s33[0m 元,无法购买'%salary,'还差:33[0;31m%s33[0m元'%(p_item[1]-salary))
else:
print("product code is not exits"%user_choice)
elif user_choice=='q':
print("---------shoping list--------------")
for p in shoping_list:
print(p)
with open("info.txt",'a',encoding='utf-8') as f:
f.write('商品：'+p[0]+'价格：')
f.write(str(p[1])+' ')
print("您的余额是:33[0;31m%s33[0m "%salary)
with open('price.txt','w',encoding='utf-8') as f:
f.write(str(salary))
print("-------------欢迎再次光临-------------")
exit()
else:
print("invalid option")