python - 如果值存在，如何让 jmespath 过滤器返回 true，如果不存在，则返回 false(python)

Question

这是对上一个未解决问题的扩展，但另一种看待问题的方式 HERE

{
  "name": "Sarah",
  "region": "south west",
  "age": 21,
  "occupation": "teacher",
  "height": 145,
  "education": "university",
  "favouriteMovie": "matrix",
  "gender": "female",
  "country": "US",
  "level": "medium",
  "tags": [],
  "data": "abc",
  "moreData": "xyz",
  "logging" : {
    "systemLogging" : [ {
      "environment" : "test",
      "example" : [ "this", "is", "an", "example", "array" ]
    } ]
  }
}

如果我想查看 python 字典中简单键值对的值是否存在，我可以使用 jmespath 查询来实现

"occupation == `teacher`"
>> True
"occupation == `dancer`"
>> False

但是对于更复杂的数据，例如带有列表/数组的嵌套字典，我能做的最好的事情就是过滤以获得值

"logging.systemLogging[?environment == `test`] | [0].enabled"
>> test
"logging.systemLogging[?environment == `prod`] | [0].enabled"
>> None

如何让上面的示例返回 True 或 False 而不是值(如果存在)和 None 或空数组 [] 如果没有

Answer 1

好吧，你完全可以这样做:

logging.systemLogging[?environment == `test`] | [0].enabled != null

开启

{
    "name": "Sarah",
    "region": "south west",
    "age": 21,
    "occupation": "teacher",
    "height": 145,
    "education": "university",
    "favouriteMovie": "matrix",
    "gender": "female",
    "country": "US",
    "level": "medium",
    "tags": [],
    "data": "abc",
    "moreData": "xyz",
    "logging": {
        "systemLogging": [{
            "environment": "test",
            "example": ["this", "is", "an", "example", "array"]
        }]
    }
}

将导致

false

虽然在这个 JSON 上也是如此——添加了 logging.systemLogging[0].enabled: false:

{
    "name": "Sarah",
    "region": "south west",
    "age": 21,
    "occupation": "teacher",
    "height": 145,
    "education": "university",
    "favouriteMovie": "matrix",
    "gender": "female",
    "country": "US",
    "level": "medium",
    "tags": [],
    "data": "abc",
    "moreData": "xyz",
    "logging": {
        "systemLogging": [{
            "enabled": false,
            "environment": "test",
            "example": ["this", "is", "an", "example", "array"]
        }]
    }
}

将导致

true