python 练习2

购物订单系统：

#!usr/bin/env python
# encoding: utf-8
import sys
i = 0
inventory_dic = {'Car':1000,'SUV':5000,'Mac':300,'iPhone':1500,'Pen':10}
account_dic = {'wyh':123,'cloudsea':456}
balance = {'wyh':10000,'cloudsea':5000}
detail_list = []
#把锁定的用户读取到空列表中
l = []
f = open('lock.txt','r')
for n in f.readlines():
    s = n.strip('\n')
    l.append(s)
f.close()

#验证用户名和密码
def verification(aot,pw):
    if aot not in account_dic.keys():
        print('你的账户名错误！')
        return 0
    elif pw != account_dic[aot]:
        print('你的密码错误！')
        return 0
    else:
        print('欢迎进入购物菜单！')
        return 1

while True:
    aot = input('请输入你的账户:').strip()
    pw = int(input('请输入密码:'))
    if aot in l:
        print('你的账号被锁定，请联系你的管理员解锁！')
        sys.exit()
    if verification(aot,pw) == 0:
        i += 1
        if i == 3:
            print('锁定账号，请联系你的管理员！')
            with open('lock.txt','a') as p:
                p.write(aot +'\n')
            sys.exit()
        continue
    else:
        print('你的账户余额:%s'% balance[aot])
        break

#进入购物系统

while True:
    for k,v in inventory_dic.items():
         print('%s:%s'%(k,v))
    Num = input('请选择你要购买的商品名称(退出:q):')
    if Num == 'q':
        print(detail_list)
        print('你的余额:%s' % balance[aot])
        sys.exit()
    elif balance[aot] < min(inventory_dic.values()):
        print('你的余额太少，请充值后在进行购买!')
        sys.exit()
    elif balance[aot] < inventory_dic[Num]:
        print('你的余额%s:你买不起，请从新选择'%balance[aot])
        continue
    elif Num in inventory_dic.keys():
        detail_list.append(Num)
        balance[aot] = balance[aot] - inventory_dic[Num]
        print('你的余额:%s' % balance[aot])
        continue
    else:
        print('你选择的商品不在清单中，请从新选择。')
        continue