1. JSONPath 表达式引用 JSON 结构，就像 XPath 表达式与 XML 文档结合使用一样。由于 JSON 结构通常是匿名的并且不一定具有“根成员对象”，因此 JSONPath 假定分配$给外层对象的抽象名称。

使用方法

jsonpath

# 如下：
{ "store": {
    "book": [ 
      { "category": "reference",
        "author": "Nigel Rees",
        "title": "Sayings of the Century",
        "price": 8.95
      },
      { "category": "fiction",
        "author": "Evelyn Waugh",
        "title": "Sword of Honour",
        "price": 12.99
      },
      { "category": "fiction",
        "author": "Herman Melville",
        "title": "Moby Dick",
        "isbn": "0-553-21311-3",
        "price": 8.99
      },
      { "category": "fiction",
        "author": "J. R. R. Tolkien",
        "title": "The Lord of the Rings",
        "isbn": "0-395-19395-8",
        "price": 22.99
      }
    ],
    "bicycle": {
      "color": "red",
      "price": 19.95
    }
  }
}

对比

python:

from jsonpath import jsonpath
jsonpath(obj, "expr")