如何处理python中来自字典的键的错误键和空值

试图处理python中来自字典的键的错误键和空值。以下是所有

资源

都有

标记

，但有些没有。我试图按如下方式处理无值，但不断出现错误

我尝试的是：

tags_info = []
resource_list = client.resources.list()
for item in (resource_list):        
    tags = item.tags
    managed_tag_value = tags['managed']
    if not managed_tag_value:
        tags_info = {"Managed": "Not Managed"}
    else:    
        tags_info = {"Managed": managed_tag_value}
    print(tags_info)

managed_tag_value = tags['managed']
TypeError: 'NoneType' object is not subscriptable

{'name': '1111name', 'Managed': 'Not Managed'}
{'name': '2222name', 'Managed': 'notbillable'}
{'name': 'BastionRDP/MicrosoftMonitoringAgent', 'Managed': 'Not Managed'}

错误：

tags_info = []
resource_list = client.resources.list()
for item in (resource_list):        
    tags = item.tags
    managed_tag_value = tags['managed']
    if not managed_tag_value:
        tags_info = {"Managed": "Not Managed"}
    else:    
        tags_info = {"Managed": managed_tag_value}
    print(tags_info)

managed_tag_value = tags['managed']
TypeError: 'NoneType' object is not subscriptable

{'name': '1111name', 'Managed': 'Not Managed'}
{'name': '2222name', 'Managed': 'notbillable'}
{'name': 'BastionRDP/MicrosoftMonitoringAgent', 'Managed': 'Not Managed'}

如何处理字典中填充了其他默认值（如NotAvailable等）的“无”值结果

编辑1:

tags_info = []
resource_list = client.resources.list()
for item in (resource_list):        
    tags = item.tags
    managed_tag_value = tags['managed']
    if not managed_tag_value:
        tags_info = {"Managed": "Not Managed"}
    else:    
        tags_info = {"Managed": managed_tag_value}
    print(tags_info)

managed_tag_value = tags['managed']
TypeError: 'NoneType' object is not subscriptable

{'name': '1111name', 'Managed': 'Not Managed'}
{'name': '2222name', 'Managed': 'notbillable'}
{'name': 'BastionRDP/MicrosoftMonitoringAgent', 'Managed': 'Not Managed'}

my

resources.list（）的每次迭代如何输出
项的示例数据如下

{'additional_properties': {}, 'id': '/subscriptions/xxxxxxxxx/resourceGroups/xxxxxxx/providers/Microsoft.Compute/snapshots/xxxxx', 'name': 'resourcename1', 'type': 'Microsoft.Compute/snapshots', 'location': 'southeastasia', 'tags': {'Name': 'xxxxxx', 'owner': 'xxxxxx', 'created date': '06022020', 'purpose': 'xxxx', 'Retention days ': 'NA'}, 'plan': None, 'properties': None, 'kind': None, 'managed_by': None, 'sku': xxxxxx, 'identity': None, 'created_time': None, 'changed_time': None, 'provisioning_state': None}
{'additional_properties': {}, 'id': '/subscriptions/xxxxxxxxxx/resourceGroups/xxxxxxx/providers/Microsoft.Compute/virtualMachines/xxxxx', 'name': 'resourcename2', 'type': 'Microsoft.Compute/virtualMachines', 'location': 'eastus', 'tags': {'Function': 'Fetch', 'Division': 'PH', 'managed_by': 'xxxxxx',  'managed': 'notbillable'}, 'plan': None, 'properties': None, 'kind': None, 'managed_by': None, 'sku': None, 'identity': None, 'created_time': None, 'changed_time': None, 'provisioning_state': None}
{'additional_properties': {}, 'id': '/subscriptions/xxxxxxxx/resourceGroups/xxxxxxx/providers/Microsoft.Compute/virtualMachines/xxxxx/extensions/MicrosoftMonitoringAgent', 'name': 'BastionRDP/MicrosoftMonitoringAgent', 'type': 'Microsoft.Compute/virtualMachines/extensions', 'location': 'eastus', 'tags': None, 'plan': None, 'properties': None, 'kind': None, 'managed_by': None, 'sku': None, 'identity': None, 'created_time': None, 'changed_time': None, 'provisioning_state': None}

我需要解决以下场景：

tags_info = []
resource_list = client.resources.list()
for item in (resource_list):        
    tags = item.tags
    managed_tag_value = tags['managed']
    if not managed_tag_value:
        tags_info = {"Managed": "Not Managed"}
    else:    
        tags_info = {"Managed": managed_tag_value}
    print(tags_info)

managed_tag_value = tags['managed']
TypeError: 'NoneType' object is not subscriptable

{'name': '1111name', 'Managed': 'Not Managed'}
{'name': '2222name', 'Managed': 'notbillable'}
{'name': 'BastionRDP/MicrosoftMonitoringAgent', 'Managed': 'Not Managed'}

我需要找出每个字典的标签，同时，如果标签中有多个项目，我只需要从标签中获取
“托管”
键
如果
'managed'
键为
null
，则将其值设置为
'nottaged'
如果
'tags'
键本身在上面的字典中不存在，那么它应该显示
“tags key missing”
首先：
tags[“managed”]
如果tags为none，则永远不会工作。这就像键入
9.5[0]
。因为它没有索引，所以不能为它编制索引。
其次，如果他们键入“无”，则您想打印某些内容，请不要编辑代码并尝试以下操作：

try:
   [insert code here]
except TypeError as error:
    print("Not subscriptable")

当它抛出错误时，except语句将捕获它，但仅当它抛出TypeError时。这意味着，如果您将9.5而不是“无”，那么输出将是相同的。
为什么不在赋值之前尝试检查键是否存在

tags_info = []
for item in client.resource_groups.list():
    print(item.name)
    tags = item.tags
    if 'managed' in tags.keys(): #this will prevent the error. assume tags is a dictionary
        managed_tag_value = tags['managed']
        if not managed_tag_value:
            tags_info = {"Managed": "Not Managed"}
        else:    
            tags_info = {"Managed": managed_tag_value}
        print(tags_info)

您甚至可以通过这样做进一步简化代码：

tags_info = []
for item in client.resource_groups.list():
    print(item.name)
    tags = item.tags
    if 'managed' in tags.keys(): #this will prevent the error. assume tags is a dictionary
        tags_info = {"Managed": tags['managed']}
    else:    
        tags_info = {"Managed": "Not Managed"}
    print(tags_info)

另外，您可以分享client.resource_组的内容吗。它看起来像一本字典。这可能更容易进一步简化

假设资源组是一个字典，并且密钥具有
“托管”
。作为一个值，您可以执行以下操作

假设资源组是一个包含以下数据项的字典：

resource_groups = {
    'abcd':'sample data 1',
    'defg':'sample data 2',
    'pqrs':'sample data 3', 
    'wxyz':'sample data 4'}

然后，您可以直接检查键
'wxyz'
是否存在，如果存在，您可以对此采取措施。代码如下所示

tag_info = {}
if 'wxyz' in resource_groups.keys():
    tags_info = {'Managed':resource_groups['wxyz']}
else:
    tags_info = {'Managed':'Not Managed'}
print(tags_info)

基于样本数据的新答案

r = {
 '1':{'additional_properties': {},
 'id': '/subscriptions/1111xxxxx/rest of text',
 'name': 'sxxxxxxx',
 'type': 'Microsoft.Compute/snapshots',
 'location': 'southeastasia',
 'tags': {
     'Name': '1111name',
     'owner': 'xxxxxx',
     'created date': '06022020',
     'purpose': 'xxxx',
     'Retention days ': 'NA'},
 'plan': None,
 'properties': None,
 'kind': None,
 'managed_by': None,
 'sku': 'xxxxxx',
 'identity': None,
 'created_time': None,
 'changed_time': None,
 'provisioning_state': None},

 '2':{'additional_properties': {},
 'id': '/subscriptions/2222xxxxxxx/rest of text',
 'name': '2222name',
 'type': 'Microsoft.Compute/virtualMachines',
 'location': 'eastus',
 'tags': {
     'Function': 'Fetch',
     'Division': 'PH',
     'managed_by': '222xxx',
     'managed': 'notbillable'},
 'plan': None,
 'properties': None,
 'kind': None,
 'managed_by': None,
 'sku': None,
 'identity': None,
 'created_time': None,
 'changed_time': None,
 'provisioning_state': None},

 '3':{'additional_properties': {},
 'id': '/subscriptions/3333xxxx/remaining text',
 'name': 'BastionRDP/MicrosoftMonitoringAgent',
 'type': 'Microsoft.Compute/virtualMachines/extensions',
 'location': 'eastus',
 'tags': None,
 'plan': None,
 'properties': None,
 'kind': None,
 'managed_by': None,
 'sku': None,
 'identity': None,
 'created_time': None,
 'changed_time': None,
 'provisioning_state': None}
}

tags_info = {}

for k,v in r.items():
    #first check if name is a key
    if 'name' in v.keys():
        #then store name as a value
        tags_info['name'] = v['name']
    else:
        #store 'No Name' as a value
        tags_info['name'] = 'No Name'
    #check if 'tags' is a key and
    #check if 'tags' is a dictionary
    if 'tags' in v.keys() and v['tags']:
        #check if 'managed' is a key inside 'tags' dictionary
        if 'managed' in v['tags'].keys():
            #then we got what we want
            tags_info['Managed'] = v['tags']['managed']
        else:
            #tags does not have 'managed' as a key
            tags_info['Managed'] = 'Not Managed'
        print (tags_info)
    else:
        #tags is not a dictionary so it is not managed
        tags_info['Managed'] = 'Not Managed'
        print (tags_info)

上述代码的输出为：

tags_info = []
resource_list = client.resources.list()
for item in (resource_list):        
    tags = item.tags
    managed_tag_value = tags['managed']
    if not managed_tag_value:
        tags_info = {"Managed": "Not Managed"}
    else:    
        tags_info = {"Managed": managed_tag_value}
    print(tags_info)

managed_tag_value = tags['managed']
TypeError: 'NoneType' object is not subscriptable

{'name': '1111name', 'Managed': 'Not Managed'}
{'name': '2222name', 'Managed': 'notbillable'}
{'name': 'BastionRDP/MicrosoftMonitoringAgent', 'Managed': 'Not Managed'}

“标签”有时是没有的吗？如果是，你不能做标记['managed']。是的，有时任何资源组都没有标记，所以我需要将这些标记打印为“notmanaged”managed\u tag\u value=tags['managed']，如果其他标记没有，对不起，无法获得它..请正确格式化它…我不知道你还想要什么，我为你写了一行代码。你能给我举一个内容资源组的例子吗。我想你可能不需要标签和其他很多东西。我制作了一些示例数据来向你展示我们如何实现简化的代码。看看这是否对你有帮助。看看我的新答案。这是一个很长的问题。请再次检查。如果您想让我也打印第三项的回复，请告诉我。为第三个也添加了代码。看看这是否有用。如果是，请向上投票我的回答并将代码标记为已回答。很高兴在此基础上进一步阐述。为此编写代码很有趣。