Question

我对python很陌生，作为一个推动自我的项目，我决定创建一个具有可更新的user：password字典的简单框架。 这仍在进行中！创建新的用户ID，然后尝试访问该用户ID时存在问题。我正在使用python 3.7。

这是错误：追溯（最近一次通话）：第37行，在如果帐户在帐户中： TypeError：“ NoneType”类型的参数不可迭代

import sys
accounts = {'Trace': 'Jollyrancher5', 'Brian': 'Kitties82', 'Taylor': 'Flower15'}

while True:
    print('Please select an option.\n1. Create new account.\n2. Enter existing account.')
    choice = input()
    if choice == '1':
        print('Please enter an account name')
        new_account = input()
        if new_account not in accounts.keys():
            print('Please enter a password.')
            new_pass = input()
            accounts = accounts.update({new_account: new_pass})
            print('Your new User ID is: ' + new_account + '.')
            print('Your new password is: ' + new_pass + '.')
            print('Please store this information for safe keeping.')
            print('Type OK to continue.')
            while True:
                next = input()
                if next == 'OK' or next == 'ok':
                    break
                else:
                    print('Invalid entry. Please type OK.')
        else:
            print('Account name taken. Please enter a different account name.')
    elif choice == '2':
        break
    else:
        print('Not a valid entry.')

account = ''
password = ''
denial = 0
while True:
    print('Please enter User ID.')
    account = input()
    if account in accounts:
        break
    else:
        print('User ID not recognized.')

while True:
    print('Please enter password.')
    password = input()
    if password == accounts[account]:
        break
    else:
        password != accounts[account]
        denial += 1
        if denial == 3:
            print('Account locked.')
            input()
            sys.exit()
print('Access Granted.\nYour account balance is $1,000,000.00.')
input()

Answer 1

删除此行：-

`accounts = accounts.update({new_account: new_pass})`

添加此行：-

`while True:
      print('Please enter User ID.')
      account = input()
      accounts.update({new_account:new_pass})
      if account in accounts:`

此错误是由于您的字典没有更新而引起的，这就是为什么它收到的第一个值是None，所以生成了NonType错误。

如果您理解我的回答，请投票。

更新字典时，Nonetype是不可迭代的吗？

1 个答案: