数据结构： goods = [ {"name": "电脑", "price": 1999}, {"name": "鼠标", "price": 10}, {"name": "游艇", "price": 20}, {"name": "美女", "price": 998}, ...... ] 基本需求： 1. 启动程序后，输入用户名密码后，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 升级需求： 1. 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 2. 允许查询之前的消费记录
代码一
#!/usr/bin/env python
# coding: utf-8
import json, sys, os
def user_login():
name_list = ["zhangsan","lisi","wangwu"] # 用户名列表
passwd_list = ["zhangsan666","lisi666","wangwu666"] # 用户的密码列表
count = [0, 0, 0] # 用户登录密码错误的次数计数
while True:
name_index = 999999 # 定义一个不存在的用户的下标
name = input("请输入你的姓名：").strip()
passwd = input("请输入你的密码：").strip()
with open("lockedname.txt","r+", encoding="utf-8") as f:
locked_name = "".join(f.readlines()).splitlines()
if name in locked_name:
print("用户已经被锁定，请联系管理员")
continue
for i in range(len(name_list)):
if name == name_list[i]:
name_index = name_list.index(name_list[i])
if name_index == 999999:
print("用户名不存在，请重新输入")
continue
if name == name_list[name_index] and passwd == passwd_list[name_index]: # 判断用户名密码
print("欢迎 %s 同学"%(name_list[name_index]))
return(0, name)
else:
count[name_index] += 1 # 同一个用户名输错密码加一
print("密码错误")
if count[name_index] == 3 :
print("3次密码错误，用户账号已被锁定")
with open("lockedname.txt","a+", encoding="utf-8") as f:
f.writelines(name_list[name_index]+"\n")
break
result = user_login() # 调用用户登录函数
if result[0] != 0: # 验证是否登录成功
sys.exit()
goods = [
{"name": "电脑", "price": 1999},
{"name": "鼠标", "price": 10},
{"name": "游艇", "price": 20},
{"name": "美女", "price": 998}
]
with open("expenses_record.txt", "r", encoding="utf-8") as f:
if os.path.getsize("expenses_record.txt") == 0: # 判断是否有登录过
expenses_record = {}
record = []
goods_list = []
salary = int(input("请输入您的工资：").strip())
else:
expenses_record = json.load(f)
try:
record = expenses_record[result[1]]
goods_list = record[1]
bought_list = " ".join(goods_list)
print("账户余额：",record[0], "已购买物品：", bought_list) # 打印记录的余额，和记录的已买物品
salary = record[0]
except KeyError:
record = []
goods_list = []
salary = int(input("请输入您的工资：").strip())
while True:
for i, good in enumerate(goods): # 生成对应序号
print(i, good["name"], good["price"])
choice = input("请输入您要购买的商品编号或q退出：").strip()
if choice.lower() == "q":
your_good = ""
for good in goods_list:
your_good += good +" "
print("您已购买的商品为：", your_good)
print("您的余额为%s元："% (salary))
record = [salary, goods_list]
user = result[1]
expenses_record[user] = record
with open("expenses_record.txt", "w", encoding="utf-8") as f:
f.write(json.dumps(expenses_record))
break
choice = int(choice)
if salary < goods[choice]["price"]:
need_money = goods[choice]["price"] - salary
print("您的余额不足，还差%s元"% ( need_money ))
else:
salary = salary - goods[choice]["price"]
goods_list.append(goods[choice]["name"])
print("\033[31;1m您已购买:%s\033[0m"%(goods[choice]["name"]), "\033[31;1m您的余额为:%s元\033[0m"%(salary))
代码二（修改版）
#!/usr/bin/env python
# coding: utf-8
import json, sys, os
def user_login():
user = {
"zhangsan": ["zhangsan666", 3, False],
"lisi": ["lisi666", 0, True],
"wangwu": ["wangwu666", 0, True]
} # 用户名：[密码，密码输错次数，False锁定用户]
while True:
name = input("请输入你的姓名：").strip()
try:
with open("lockedname.txt", "r+", encoding="utf-8") as f:
user = json.load(f) # 若是有lockedname.txt文件，则user重新赋值
except Exception as err:
pass
if name not in user:
print("用户名不存在，请重新输入")
continue
elif user[name][2] == False:
print("用户已经被锁定，请联系管理员")
continue
elif name in user:
passwd = input("请输入你的密码：").strip()
if passwd == user[name][0]: # 判断用户名密码
print("欢迎 %s 同学" % (name))
user[name][1] = 0
with open("lockedname.txt", "w", encoding="utf-8") as f:
json.dump(user, f)
break
else:
user[name][1] += 1 # 同一个用户名输错密码加一
print("密码错误")
if user[name][1] >= 3:
print("用户账号已被锁定")
user[name][2] = False
with open("lockedname.txt", "w", encoding="utf-8") as f:
json.dump(user, f)
result = user_login() # 调用用户登录函数
if result[0] != 0: # 验证是否登录成功
sys.exit()
goods = [
{"name": "电脑", "price": 1999},
{"name": "鼠标", "price": 10},
{"name": "游艇", "price": 20},
{"name": "美女", "price": 998}
]
with open("expenses_record.txt", "r", encoding="utf-8") as f:
if os.path.getsize("expenses_record.txt") == 0: # 判断是否有登录过
expenses_record = {}
record = []
goods_list = []
salary = int(input("请输入您的工资：").strip())
else:
expenses_record = json.load(f)
try:
record = expenses_record[result[1]]
goods_list = record[1]
bought_list = " ".join(goods_list)
print("账户余额：",record[0], "已购买物品：", bought_list) # 打印记录的余额，和记录的已买物品
salary = record[0]
except KeyError:
record = []
goods_list = []
salary = int(input("请输入您的工资：").strip())
while True:
for i, good in enumerate(goods): # 生成对应序号
print(i, good["name"], good["price"])
choice = input("请输入您要购买的商品编号或q退出：").strip()
if choice.lower() == "q":
your_good = ""
for good in goods_list:
your_good += good +" "
print("您已购买的商品为：", your_good)
print("您的余额为%s元："% (salary))
record = [salary, goods_list]
user = result[1]
expenses_record[user] = record
with open("expenses_record.txt", "w", encoding="utf-8") as f:
f.write(json.dumps(expenses_record))
break
choice = int(choice)
if salary < goods[choice]["price"]:
need_money = goods[choice]["price"] - salary
print("您的余额不足，还差%s元"% ( need_money ))
else:
salary = salary - goods[choice]["price"]
goods_list.append(goods[choice]["name"])
print("\033[31;1m您已购买:%s\033[0m"%(goods[choice]["name"]), "\033[31;1m您的余额为:%s元\033[0m"%(salary))
原文：https://www.cnblogs.com/zhaohw127/p/10495082.html