初学者，仅供学习交流
1.工作流程
2.模拟自动存取款机的操作
程序导入了msvcrt 模块，实现用户输入密码时星号（*）隐藏的功能，该模块只用于 Windows/DOS，因此在 cmd 下运行正常，但用别的 IDLE执行时会出现卡顿和接收不了键盘输入的情况。
代码如下：
import msvcrt, sys, os#定义用星号隐藏密码输入的函数def psw_input():li = []while True:ch = msvcrt.getch()#回车if ch == b'\r':msvcrt.putch(b'\n')break#退格elif ch == b'\x08':if li:li.pop()msvcrt.putch(b'\b')msvcrt.putch(b' ')msvcrt.putch(b'\b')#Escelif ch == b'\x1b':breakelse:li.append(ch)msvcrt.putch(b'*')return li#定义CSDN银行ATM欢迎界面的函数def ATM():'''CSDN银行ATM欢迎界面的函数'''print("="*14,"Bank of CSDN","="*14,"\n")print("{:^42}".format("ATM"),"\n")print("="*14,"Bank of CSDN","="*14,"\n")#CSDN银行用户列表信息，用户信息包含：姓名、余额、密码（6位）、银行卡号（19位）user_list = [{"name":"张 三","balance":10000,"password":"000000","numbers":"0000000000000000000"},{"name":"李 四","balance":20000,"password":"111111","numbers":"1111111111111111111"},{"name":"王 五","balance":30000,"password":"222222","numbers":"2222222222222222222"}]#定义验证银行卡号与密码匹配的函数def check(user_name,user_password):'''验证银行卡号与密码匹配的函数''' for i in range(len(user_list)):if user_name == user_list[i]["numbers"] and user_password == user_list[i]["password"]:return i #银行卡号与密码匹配则返回该用户在ATM系统内的ID值，否则返回None值#定义用户登录成功后操作界面的函数def interface():'''用户登录成功后操作界面的函数'''print("="*14,"用户操作界面","="*14,"\n")print("{0:2} {1:12} {2:12} {3:12}".format(" ","1. 查询","2. 取款","3. 存款"),"\n")print("{0:2} {1:10} {2:12}".format(" ","4. 修改密码","5. 退出"),"\n")print("="*42,"\n")#定义用户查询信息的函数def inquire(user_id):'''用户查询信息的函数'''print("="*14,"账号查询界面","="*14,"\n")print("|{0:<4}|{1:<18}|{2:<9}|\n".format("账户名","卡号","余额(RMB)"))print("|{0:<5}|{1:<20}|{2:<11}|\n".format(user_list[user_id]["name"],user_list[user_id]["numbers"],user_list[user_id]["balance"]))#定义用户取款的函数def withdrawal(amount):'''用户取款的函数'''i = user_list[user_id]["balance"]-int(amount)if i>=0:user_list[user_id]["balance"]-=int(amount)else:print("账户余额不足\n")#定义用户存款的函数def deposit(amount):'''用户存款的函数'''user_list[user_id]["balance"]+=int(amount)#定义用户修改密码的函数def change_password(old_password,new_password1,new_password2):'''用户修改密码的函数'''if old_password == user_list[user_id]["password"]:if new_password1 == new_password2:user_list[user_id]["password"] = new_password1print("新密码修改成功\n")return 1else:print("修改密码失败，您2次输入的新密码不一致\n")return 2else:print("旧密码输入错误\n")return 0#用户登录界面，输入银行卡号和密码chance = 3 #允许3次用户名或密码输入错误while True:ATM()user_name = input("请输入您的银行卡卡号：")print("")print("请输入您的银行卡密码:", end=' ', flush=True)user_password = b''.join(psw_input()).decode()print("")user_id = check(user_name,user_password)#验证银行卡号与密码是否匹配if user_id != None:print("登录成功\n")while True:interface()key_word = input("请输入操作选项：")print("")if key_word == "1":inquire(user_id)input("按任意键返回上一级目录:")print("")elif key_word == "2":print("="*14,"账号取款界面","="*14,"\n")amount = input("请输入取款金额：")print("")withdrawal(amount)inquire(user_id)input("按任意键返回上一级目录:")print("")elif key_word == "3":print("="*14,"账号存款界面","="*14,"\n")amount = input("请输入存款金额：")print("")deposit(amount)inquire(user_id)input("按任意键返回上一级目录:")print("")elif key_word == "4":print("="*14,"密码管理界面","="*14,"\n")print("请输入旧密码:", end=' ', flush=True)old_password = b''.join(psw_input()).decode()print("")print("请输入新密码:", end=' ', flush=True)new_password1 = b''.join(psw_input()).decode()print("")print("请再次输入新密码:", end=' ', flush=True)new_password2 = b''.join(psw_input()).decode()print("")save = change_password(old_password,new_password1,new_password2)#如何检测到旧密码输入有误，将直接退出if save == 0:breakelif key_word == "5":print("="*14,"欢迎下次光临","="*14,"\n")breakelse:print("="*14,"没有该选项","="*14,"\n")else:if chance > 1:print("用户名或密码错误，您还有",chance-1,"次机会，请重新输入\n")chance -= 1else:print("对不起，您输入用户名或密码错误已达3次")break
3.运行结果
有以下初始用户信息备测试用：
输入卡号和密码进入用户操作界面
查询余额界面
取款界面
存款界面
修改密码界面
欢迎大家提出改进意见
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