NoneType'对象没有属性'__getitem__'

Question

在openstack设置中尝试nova-list cli命令时出现以下错误。 NoneType'对象没有属性' getitem '

 DEBUG (shell:777) 'NoneType' object has no attribute '__getitem__'
    Traceback (most recent call last):
      File "/opt/stack/python-novaclient/novaclient/shell.py", line 774, in main
        OpenStackComputeShell().main(map(strutils.safe_decode, sys.argv[1:]))
      File "/opt/stack/python-novaclient/novaclient/shell.py", line 685, in main
        self.cs.authenticate()
      File "/opt/stack/python-novaclient/novaclient/v1_1/client.py", line 169, in authenticate
        self.client.authenticate()
      File "/opt/stack/python-novaclient/novaclient/client.py", line 382, in authenticate
        auth_url = self._v2_auth(auth_url)
      File "/opt/stack/python-novaclient/novaclient/client.py", line 469, in _v2_auth
        return self._authenticate(url, body)
      File "/opt/stack/python-novaclient/novaclient/client.py", line 484, in _authenticate
        return self._extract_service_catalog(url, resp, respbody)
      File "/opt/stack/python-novaclient/novaclient/client.py", line 307, in _extract_service_catalog
        self.auth_token = self.service_catalog.get_token()
      File "/opt/stack/python-novaclient/novaclient/service_catalog.py", line 29, in get_token
        return self.catalog['access']['token']['id']
    TypeError: 'NoneType' object has no attribute '__getitem__'
    ERROR: 'NoneType' object has no attribute '__getitem_

_'

这是什么意思？我的openstack设置有问题还是与python相关的错误？

Answer 1

从字面上看，'NoneType' object has no attribute...表示您尝试访问属性或在值为None的内容上调用方法。

实际上，这意味着您可能在某个地方使用变量之前有错误，或者使用返回None的函数中的值。调试此问题的第一步是问问自己＆＃34;为什么此变量设置为None？＆＃34;。

在这种特定情况下，self.catalog，self.catalog['access']或self.catalog['access']['token']为None。

Answer 2

错误消息

TypeError: 'NoneType' object has no attribute '__getitem__'

原因

在另一个函数调用的参数列表中调用void方法，导致我出现“NoneType”错误。

解决方案

要解决，我只是让void方法在其他函数的参数列表中返回我需要的值。