python练习2 购物车程序

#  -*-   coding: utf-8   -*-
# @Time      : 2018/10/18 16:06
# @Author    : Two Brother
# @EMAIL     : [email protected]
# @FILE      : shoppingcart.py
# @SOFTWARE : PyCharm

##################title#####################
#用户入口：
#1.商品信息存在文件里
##
#商家入口：
#2.可以添加商品，修改商品价格
############################################
with open('use','r+',encoding='utf-8') as fu:
 dictfu = {}
 lines1 = fu.readlines()
 for line in lines1:
 (key,value) = line.strip().split()
 dictfu[key] = value
with open('commodity', 'r+', encoding='utf-8') as fc:
 dictfc = {}
 lines2 = fc.readlines()
 for line in lines2:
 (key,value1,value2) = line.strip().split()
 dictfc[key] = {value1:value2}
with open('admin','r') as fa:
 admin = fa.readlines()
 for i in range(0,len(admin)):
 admin[i] = admin[i].strip()
i = input("请输入您的账号>>>>>>>>>>")
if i in dictfu.keys():
 lastmoney = int(dictfu[i])
 print('我是会员%s，我的余额%s' % (i,lastmoney))
 for n in dictfc:
 print(n,dictfc[n])
 buy = []
 salecost = 0
 while True:
 ic = input("请输入您要购买的商品编号>>>>>>>")
 if ic in dictfc.keys():
 print("商品%s已经加入购物车,查看购物车请按S,直接支付请按P" % dictfc[ic])
 buy.append(dictfc[ic])
 for x in dictfc[ic]:
 salecost = salecost + int(dictfc[ic][x])
 continue
 elif ic.upper() == 'S':
 print("您的购物车信息如下,总计%s元，直接支付请按P" % salecost)
 for y in buy:print(y)
 continue
 elif ic.upper() == 'P':
 if salecost <= lastmoney:
 lastmoney2 = lastmoney - salecost
 print("您本次消费金额%s元，余额还剩余%s元！欢迎下次光临" % (salecost,lastmoney2))
 with open('use', 'w', encoding='utf-8') as fu2:
 for line in lines1:
 if i in line:
 line = line.replace(str(lastmoney),str(lastmoney2))
 fu2.write(line)
 break
 else:
 pi = input("您本次购物需要花费金额%s元，余额只有%s元，交易失败，重新购物请按B，充值请按R，退出请按其他键>>>>"%(salecost,lastmoney))
 if pi.upper() == 'B':
 continue
 if pi.upper() == 'R':
 print("充值功能待开放")
 break
 else:
 break
 else:
 break

elif i in admin:
 while True:
 ai = input("请选择你要做的操作：A查看商品 B修改商品价格 C添加删除商品>>>>>")
 if ai.upper() == 'A':
 for o in dictfc:
 print(o,dictfc[o])
 continue
 elif ai.upper() == 'B':
 bi = input("请选择你要修改商品的商品编号>>>>")
 if bi in dictfc:
 print(dictfc[bi])
 bi2 = input("请输入你要修改此商品的价格>>>>")
 with open('commodity','w',encoding='utf-8') as fc2:
 for line in lines2:
 if bi in line:
 for bi3 in dictfc[bi]:
 line = line.replace(dictfc[bi][bi3],bi2)
 fc2.write(line)
 with open('commodity', 'r', encoding='utf-8') as fc3:
 lines3 = fc3.readlines()
 for line in lines3:
 (key, value1, value2) = line.strip().split()
 dictfc[key] = {value1: value2}
 else:
 print("商品编码输入有误，请重新输入")
 continue
 else:
 print('程序退出')
 break
else:
 print('用户不存在')