如果值存在，我怎样才能让 jmespath 过滤器返回 true，如果不存在则返回 falsepython

如何解决如果值存在，我怎样才能让 jmespath 过滤器返回 true，如果不存在则返回 falsepython

这是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 字典中是否存在简单键值对的值，我可以使用 jmespath 查询来执行此操作

"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取值

"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 []（如果不存在）

解决方法

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"]
        }]
    }
}

会导致

false

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

{
    "name": "Sarah","logging": {
        "systemLogging": [{
            "enabled": false,"environment": "test","array"]
        }]
    }
}

会导致

true