Python3 适合初学者学习的银行账户登录系统实例

'''银行登录系统'''uname = "bob"passwd = 123judgment = 0choice = 2for i in range(3): username = input("请输入用户名：") password = int(input("请输入密码：")) if username == uname and password == passwd: #用户名和密码必须同时成立  print("~~~欢迎%s使用银行自助服务系统~~~" %uname) # %s是占位符  judgment = 1  break else:  if choice != 0:   print("！！！登陆失败！！！" + "您还有" + str(choice) + "次机会")  else:   print("！！！登陆失败！！！")  choice = choice - 1if judgment == 0:  print("三次机会已用完，此卡将冻结10分钟") #只是提示信息，冻结操作并未编写# 第二种思路# uname = "bob"# passwd = 123## choice = 2## for i in range(3):#  username = input("请输入用户名：")#  password = int(input("请输入密码："))#  if username == uname and password == passwd:#   print("~~~欢迎%s使用银行自助服务系统~~~" %uname) # %s是占位符##   break#  else:#   if choice != 0:#    print("！！！登陆失败！！！" + "您还有" + str(choice) + "次机会")#   else:#    print("！！！登陆失败！！！")#   choice = choice - 1# else:#  print("三次机会已用完，此卡将冻结10分钟")# #