python键dict错误多级dict

我不完全确定我为什么会遇到字典键错误。我试图创建一个带有=符号的多级dict，并在度量上得到一个关键错误，但在前两个上没有

doc['timestamp']

及

两者都可以很好地工作，但当它到达度量时，它会给我一个度量键错误。我不完全清楚为什么

doc = {}
doc['timestamp'] = datetime.now()    
#doc['instance_id'] = get_cloud_app_name()
doc['instance_id'] = "MyMac"

cpu_dict_returned = get_cpu_info()
doc['metrics']['cpu_usage']['user_cpu'] = cpu_dict_returned['user_cpu']
doc['metrics']["cpu_usage"]['system_cpu'] = cpu_dict_returned['system_cpu']
doc['metrics']["cpu_usage"]['idle_cpu'] = cpu_dict_returned['idle_cpu']
doc['metrics']["cpu_usage"]['cpu_count'] = cpu_dict_returned['cpu_count']

---

在使用子词典之前，必须先创建子词典：

doc = {}
doc['timestamp'] = datetime.now()    
doc['instance_id'] = "MyMac"

cpu_dict_returned = get_cpu_info() 
doc['metrics'] = {}
doc['metrics']['cpu_usage'] = {}
doc['metrics']['cpu_usage']['user_cpu'] = cpu_dict_returned['user_cpu']
doc['metrics']["cpu_usage"]['system_cpu'] = cpu_dict_returned['system_cpu']
doc['metrics']["cpu_usage"]['idle_cpu'] = cpu_dict_returned['idle_cpu']
doc['metrics']["cpu_usage"]['cpu_count'] = cpu_dict_returned['cpu_count']

---

在使用子词典之前，必须先创建子词典：

doc = {}
doc['timestamp'] = datetime.now()    
doc['instance_id'] = "MyMac"

cpu_dict_returned = get_cpu_info() 
doc['metrics'] = {}
doc['metrics']['cpu_usage'] = {}
doc['metrics']['cpu_usage']['user_cpu'] = cpu_dict_returned['user_cpu']
doc['metrics']["cpu_usage"]['system_cpu'] = cpu_dict_returned['system_cpu']
doc['metrics']["cpu_usage"]['idle_cpu'] = cpu_dict_returned['idle_cpu']
doc['metrics']["cpu_usage"]['cpu_count'] = cpu_dict_returned['cpu_count']

---

您可以使用字典理解更简洁地执行此操作：

doc = {}
doc['timestamp'] = datetime.now()    
doc['instance_id'] = "MyMac"

cpu_dict_returned = get_cpu_info() 
doc['metrics'] = {
    'cpu_usage':
        {k: cpu_dict_returned.get(k) 
         for k in ['user_cpu', 'system_cpu', 'idle_cpu', 'cpu_count']}
}

---

请注意，首先创建子字典

cpu\u用法

，然后插入嵌套字典。

您可以使用字典理解更简洁地执行此操作：

doc = {}
doc['timestamp'] = datetime.now()    
doc['instance_id'] = "MyMac"

cpu_dict_returned = get_cpu_info() 
doc['metrics'] = {
    'cpu_usage':
        {k: cpu_dict_returned.get(k) 
         for k in ['user_cpu', 'system_cpu', 'idle_cpu', 'cpu_count']}
}

---

请注意，首先创建子字典

cpu\u usage

，然后插入嵌套字典。

谢谢，我不知道我通常通过定义结构来创建dict。谢谢，我不知道我通常通过定义结构来创建dict。