python基础(第二周)
2017-03-27 18:16 cnuser007 阅读(186) 评论(0) 收藏 举报购物车小程序
一.作业需求:
1、启动程序后,输入用户名密码后,如果是第一次登录,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

二、代码
# -*- coding:utf-8 -*-
shopping_car =[]#定义一个购物车
product_list_tatol = "product list"
welcome = "welcome to shopping market"
product_list = [
('iphone',5888),
('lenovo',2998),
('cup',12),
('thinkpad',4500),
('notebook',6)
]
#商品清单
print ( welcome.center(80,"*") )
salary = input("input your salary:>>>") #输入工资
if salary.isdigit():
salary = int(salary)#转换为整数
while True:
print (product_list_tatol.center(80,"*"))#打印商品清单
for item in product_list:#遍历商品清单
print (product_list.index(item)+1,item)#打印商品清单
choice = input("choice you want to buy,0 to exit:>>> ")#输入要购买的商口
if choice.isdigit():
choice = int(choice)
if choice > 5 or choice < 0:#商品选项为0至5之间的整数
print ("您选的商品不存在,请重新选择")
continue
elif choice <=5 and choice >=1:
if salary < product_list[choice-1][1]:#比较工资和商品价格
print ("账户余额不足,请购买其他商品或者退出")
continue
else:
pass
item_choice = product_list[choice-1]#选择商品
shopping_car.append(item_choice)#将商品添加到购物车
print ("you buy goods is", shopping_car)
salary = salary - product_list[choice-1][1]#计算余额
print ("your balance is %d"%(salary))#打印余额
elif choice == 0 :#退出购物,打印所购商品和余额
print ("you buy goods is",shopping_car,)
print ( "your balance is %d"%(salary))
exit()
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