收到以下错误int＆＃39;对象没有属性＆＃39; __ getitem __＆＃39;

Question

当我尝试从

运行以下代码时

https://github.com/awslabs/aws-config-rules/blob/master/python/iam-inactive-user.py

我收到了下面提到的错误。试过

    {
  "stackTrace": [
    [
      "/var/task/lambda_function.py",
      40,
      "lambda_handler",
      "invoking_event = json.loads(event[\"invokingEvent\"])"
    ]
  ],
  "errorType": "TypeError",
  "errorMessage": "'int' object has no attribute '__getitem__'"
}