1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 #Author:SKING 4  5 """ 6 题目：购物车 7 1.启动程序后，让用户输入工资，然后打印商品列表。 8 2.允许用户根据商品编号购买商品。 9 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。10 4.可随时退出，退出时，打印已购买商品和余额。11 12 """13 14 import sys, os, time, string15 16 def commodity_list():17     """打印商品列表"""18     with open('commodity_list.txt', 'r') as file_commodity_list: # 打开商品列表文件commodity_list.txt19         for commodity_list in file_commodity_list:20             # 处理商品列表，并分别将序号、商品名称、商品价格、数量赋值给变量(serial_num, commdity_name, commodity_price, commdity_num)21             (serial_num, commdity_name, commodity_price, commdity_num) = commodity_list.strip().split('\t')22             dict_commodity_list.update({serial_num: (commdity_name, commodity_price, commdity_num)})  # 将商品列表存在字典里23             # 打印商品列表24             print(f'{serial_num.ljust(5)}\t{commdity_name.ljust(20)}\t{commodity_price.ljust(8)}\t{commdity_num.ljust(5)}')25         return dict_commodity_list26 27 28 count = 0 #记录用户输入工资的次数29 dict_commodity_list = {} #存放商品列表的字典30 count_buy = 0 # 统计已买的商品数量31 price_buy = 0 # 统计已买的商品总价32 33 serial_num_count = [] # 存放已购商品的序号，也就是字典dict_commodity_list的key34 buy_num = 0 #结算的时候打印已购商品的序列号35 36 37 while count<5:38     count += 139     if count == 5: #如果用户输入次数超过5次，就提示休息5s40         print('You have input too many times!')41         print('Please wait 5s...')42         for a in range(5,1,-1):43             print(f'{a}s...')44             time.sleep(1)45         count = 046 47     salary = input('Please enter your salary:') #提示让让用户输入工资48     if salary.isdigit(): #判断输入是否是数字49         commodity_list()50         Salary_balance = salary  # 统计剩余的工资51 52     else:53         print('\n\nEnter wrong!try again!')54         continue55 56     while True:57         #os.system('cls') # 清屏58         print('Press "O" to settle accounts!')59         commdity_serial_num = input('Enter the serial number("Q" to exit):')  # 提示让用户输入想要购买的商品序号60 61         if commdity_serial_num in dict_commodity_list.keys():  #判断输入是否是商品的列表序号62             Salary_balance = 063             dict_commodity_list = commodity_list()64             price_buy = price_buy + float(dict_commodity_list[commdity_serial_num][1]) # 已购商品价格总额65             count_buy += 1 #统计已买商品数量66             Salary_balance = int(salary) - price_buy #工资余额67             serial_num_count.append(commdity_serial_num) #统计已购商品的序号，也就是字典dict_commodity_list的key68             commodity_list()69             print(f'Have buy commodities:{count_buy},\tSalary balance:{Salary_balance}\n\n')70 71         else:72             if commdity_serial_num == 'O' or commdity_serial_num == 'o':73                 #结算,显示已购商品、总价，剩余工资等信息74                 #os.system('cls') # 清屏75                 print('\nHave buy commdity list:')76                 for b in serial_num_count:  #打印已购商品列表77                     buy_num += 178                     print(f'\n{str(buy_num).ljust(5)}\t{dict_commodity_list[b][0].ljust(20)}\t{dict_commodity_list[b][1].ljust(8)}\t{dict_commodity_list[b][2].ljust(5)}\t')79 80                 print(f'\nBuy commdities:{count_buy}, total price:{price_buy}\n')81                 print(f'Salary balance:{Salary_balance}')82                 sys.exit(0)83             elif commdity_serial_num == 'q' or commdity_serial_num == 'Q':84                 sys.exit(0)85             else:86                 print('\nEnter wrong!try again!')87                 continue