2. # 注册
    3. userAccount = {'1001':{'password':'123456','balance':'10000','currency':'CNY','status':'active'},
    4.                 '1002':{'password':'111111','balance':'-200','currency':'CNY','status':'active'},
    5.                 '1003':{'password':'222222','balance':'2000000','currency':'CNY','status':'active'},
    6.                 '1004':{'password':'333333','balance':'8000000','currency':'CNY','status':'active'}
    7. }
    8. a = '2'
    9. while True:
    10.     print('1.[登录]','2.[注册]',sep='\n')
    11.     choice = input('请输入您的选择:')
    12.     if choice == '2':
    13.         user_id = input('请输入用户账号:')
    14.         if user_id in userAccount:
    15.             print('该账号已经存在,不能注册')
    16.         else:
    17.             user_password = input("请输入密码:")
    18.             newSet = {user_id: {'password': user_password, 'balance': '0', 'currency': 'CNY', 'status': 'active'}}
    19.             userAccount.update(newSet)
    20.     elif choice == '1':
    21.         log_id = input('请输入您的账号:')
    22.         if log_id not in userAccount:
    23.             print('您输入的账号不存在')
    24.         else:
    25.             for count in range(0, 3) :
    26.                 log_password = input("请输入密码:")
    27.                 if log_password != userAccount[log_id]['password']:
    28.                     print('您的密码错误,请重新输入')
    29.                     if count == 2:
    30.                         print('您的密码输入错误3次，请联系管理员')
    31.                 else:
    32.                     while True:
    33.                         print('【1. 查询】', '【2. 存款】', '【3. 取款】', '【4. 转账】', '【5. 返回】', sep='\n')
    34.                         choice2 = input('请输入您需要的功能:')
    35.                         if  choice2 == '1':
    36.                             print('您的余额是:%s'%userAccount[log_id]['balance'])
    37.                         elif choice2 == '2':
    38.                             deposit = input('请输入存款金额:')
    39.                             deposit = int(deposit)
    40.                             user_balance = int(userAccount[log_id]['balance'])
    41.                             sum_balance = deposit + user_balance
    42.                             userAccount[log_id]['balance'] = str(sum_balance)
    43.                             print('您存入了%s'%deposit)
    44.                             print('你的余额是:%s'%userAccount[log_id]['balance'])
    45.                         elif choice2 == '3':
    46.                             cash = int(input('请输入取款金额'))
    47.                             user_balance = int(userAccount[log_id]['balance'])
    48.                             if cash > user_balance:
    49.                                 print('您的余额不足')
    50.                             else:
    51.                                 print(f'本次取款:{cash}')
    52.                                 new_balance = user_balance - cash
    53.                                 userAccount[log_id]['balance'] = str(new_balance)
    54.                                 print('你的余额是:%s'%userAccount[log_id]['balance'])
    55.                         elif choice2 == '4':
    56.                             other_id = input('请输入需要转账的账号')
    57.                             if other_id not in userAccount:
    58.                                 print('对方账号不存在')
    59.                             elif other_id == log_id:
    60.                                 print('不能对自己转账')
    61.                             else:
    62.                                 other_cash = int(input("请输入转账金额:"))
    63.                                 user_balance = int(userAccount[log_id]['balance'])
    64.                                 other_balance = int(userAccount[other_id]['balance'])
    65.                                 if other_cash > user_balance:
    66.                                     print('您的余额不足')
    67.                                 else:
    68.                                     print(f'本次转账:{other_cash}')
    69.                                     new_balance01 = user_balance - other_cash  # 我方余额
    70.                                     userAccount[log_id]['balance'] = str(new_balance01)
    71.                                     print('你的余额是:%s' % userAccount[log_id]['balance'])
    72.                                     new_balance02 = other_balance + other_cash  # 对方余额
    73.                                     userAccount[other_id]['balance'] = str(new_balance02)
    74.                         elif choice2 == '5':
    75.                             break
    76.                         else:
    77.                             print('没有该功能,请重新选择!')
    78.                     break