如何在python中从json中提取多个值

我有这样一个JSON文件:

print(resp)
dataList = []
{
  "totalCount": 9812,
  "pageSize": 50,
  "nextPageKey": "12345",
  "problems": [
    {
      "problemId": "1234",
      "displayId": "test1",
      "title": "host memory saturation",
      "impactLevel": "INFRASTRUCTURE",
      "severityLevel": "RESOURCE_CONTENTION",
      "status": "OPEN"
     }
     ]
}

我需要提取“title”、“impactLevel”和“severityLevel”,并创建一个数据框架:

我试过:

dataList.append([resp['problems'][0]['title']['impactLevel']['severityLevel']])
hyperEntitydf = pd.DataFrame(dataList, columns=['Alert','Type','Severity'])
hyperEntitydf=hyperEntitydf.drop_duplicates()
print(hyperEntitydf.head())

在这一行:

 dataList.append([resp['problems'][0]['title']['impactLevel']['severityLevel']])

我得到了这个错误:

TypeError: string indices must be integers

一次调用可以提取多个字段吗?

dataList.append([resp['problems'][0]['title']['impactLevel']['severityLevel']])