#!/usr/bin/env python#-*- coding:UTF-8 -*-#----------------------------------------------------------------------------------------------------------------------#说明：# 购物车程序：# 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# 5、在用户使用过程中， 关键输出，如余额，商品已加入购物车等消息，需高亮显示# 6、用户下一次登录后，输入用户名密码，直接回到上次的状态，即上次消费的余额什么的还是那些，再次登录可继续购买# 7、允许查询之前的消费记录#-----------------------------------------------------------------------------------------------------------------------import os#定义代码运行时处理数据的字典dict_user_info= {}#定义代码运行时处理数据的列表shoped = []#退出标志flag = 0def write_file(salary,shoped,name): f1 = open("%s-new.txt" % name, 'a', encoding="utf-8") shoped = ",".join(shoped) f1.write("salary:%s\n" % salary) f1.write("shoped:%s" % shoped) f1.close() os.remove("%s.txt"% name) os.rename("%s-new.txt" % name,"%s.txt" % name) return 0######################格式化输出#########################info = '''------------------List------------------1.足球: {a}2.篮球: {b}3.网球: {c}4.橄榄球: {d}5.退出6.查询消费记录'''.format(a=100,b=120,c=80,d=50)#########################################################while flag ==0: name = input("用户名：") passwd = input("密码：") if not os.path.exists("%s.txt" % name): salary = int(input("请输入工资：")) print(info) dict_user_info["salary"] = salary dict_user_info["shoped"] = shoped f = open("%s.txt" % name, 'a',encoding = "utf-8") f.write("salary:%s\n" % salary) f.write("shoped:") f.close() while True: print(info) choice = input("请选择：") if choice == "1" or choice == "足球": if salary - 100 >= 0: salary -= 100 print(salary) shoped.append("足球") else: print("余额不足") write_file(salary=salary,shoped=shoped,name=name) flag = 1 break if choice == "2" or choice == "篮球": if salary - 120 >= 0: salary -= 120 print(salary) shoped.append("篮球") else: print("余额不足") write_file(salary=salary, shoped=shoped, name=name) flag = 1 break if choice == "3" or choice == "网球": if salary - 80 >= 0: salary -= 80 print(salary) shoped.append("网球") else: print("余额不足") write_file(salary=salary, shoped=shoped, name=name) flag = 1 break if choice == "4" or choice == "橄榄球": if salary - 50 >= 0: salary -= 50 print(salary) shoped.append("橄榄球") else: print("余额不足") write_file(salary=salary, shoped=shoped, name=name) flag = 1 break if choice == "5" or choice == "退出": write_file(salary=salary, shoped=shoped, name=name) print("欢迎下次再来！") flag = 1 break if choice == "6" or choice == "查询消费记录": print("余额为%s" % salary) print(dict_user_info["shoped"]) else: with open("%s.txt" % name,'r+',encoding = 'utf-8') as f: for i in f: if "salary" in i: i = i.strip().split(":") salary = int(i[1]) print("余额为%s" % salary) if "shoped" in i: i = i.strip().split(":") shoped = i[1].split(",") print("已购买%s" % shoped) dict_user_info["salary"] = salary dict_user_info["shoped"] = shoped choice1 = input("继续购买请按1，退出请按2") if choice1 == "2": flag = 1 break if choice1 == "1": while True: print(info) choice1 = input("请选择：") if choice == "1" or choice == "足球": if salary - 100 >= 0: salary -= 100 print(salary) shoped.append("足球") else: print("余额不足") write_file(salary=salary, shoped=shoped, name=name) flag = 1 break if choice1 == "2" or choice == "篮球": if salary - 120 >= 0: salary -= 120 print(salary) shoped.append("篮球") else: print("余额不足") write_file(salary=salary, shoped=shoped, name=name) flag = 1 break if choice1 == "3" or choice == "网球": if salary - 80 >= 0: salary -= 80 print(salary) shoped.append("网球") else: print("余额不足") write_file(salary=salary, shoped=shoped, name=name) flag = 1 break if choice1 == "4" or choice == "橄榄球": if salary - 50 >= 0: salary -= 50 print(salary) shoped.append("橄榄球") else: print("余额不足") write_file(salary=salary, shoped=shoped, name=name) flag = 1 break if choice1 == "5" or choice == "退出": write_file(salary=salary, shoped=shoped, name=name) print("欢迎下次再来！") flag = 1 break if choice1 == "6" or choice == "查询消费记录": print("余额为%s" % salary) print(dict_user_info["shoped"])
来源：https://www.cnblogs.com/lzj-HH/p/7482651.html