Python Json读写操作之JsonPath怎么使用
Python Json读写操作_JsonPath用法详解
1. 介绍
JSONPath是一种信息抽取类库,是从JSON文档中抽取指定信息的工具,提供多种语言实现版本,包括Javascript、Python、PHP和Java。
JSONPath的安装方法如下:pip install jsonpath
JSONPath语法和XPATH语法对比,JSON结构清晰,可读性高,复杂度低,非常容易匹配。JSONPath的语法与Xpath类似,如下表所示为JSONPath与XPath语法对比:
2. 代码示例
bookJson = { "store": { "book":[ { "category": "reference", "author": "Nigel Rees", "title": "Sayings of the Century", "price": 8.95 }, { "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 } } }登录后复制
变量bookJson中已经包含了这段JSON字符串,可通过以下代码反序列化得到JSON对象:
books=json.loads(bookJson)登录后复制
1)查看store下的bicycle的color属性:
checkurl = "$.store.bicycel.color" print(jsonpath.jsonpath(books, checkurl)) # 输出:['red']登录后复制
2)输出book节点中包含的所有对象:
checkurl = "$.store.book[*]" object_list=jsonpath.jsonpath(books, checkurl) print(object_list)登录后复制
3)输出book节点的第一个对象:
checkurl = "$.store.book[0]" obj = jsonpath.jsonpath(books, checkurl) print(obj) # 输出: ['category': 'reference', 'author': 'Nigel Rees', 'title': 'Sayings of the Century', 'price': 8.95}]登录后复制
4)输出book节点中所有对象对应的属性title值:
checkurl = "$.store.book[*].title" titles = jsonpath.jsonpath(books, checkurl) print(titles) # 输出: ['Sayings of the Century', 'The Lord of the Rings']登录后复制
5)输出book节点中category为fiction的所有对象:
checkurl = "$.store.book[?(@.category=='fiction')]” books=jsonpath.jsonpath(books, checkurl) print(books) # 输出:[{'category': 'fiction', 'author': 'J. R. R. Tolkien', 'title': 'The Lordof the Rings', 'isbn': '0-395-19395-8', 'price': 22.99}]登录后复制
6)输出book节点中所有价格小于10的对象:
checkurl="$.store.book[?(@.price<10)]" books = jsonpath.jsonpath(books, checkurl) print(books) # 输出: [{'category': 'reference', 'author': 'Nigel Rees', 'title':'Sayings of the Century', 'price': 8.95}]登录后复制
7)输出book节点中所有含有isb的对象:
checkurl = "$.store.book[?(@.isb)]" books = jsonpath.jsonpath(books,checkurl) print(books) # 输出: [{'category': 'fiction', 'author': 'J. R. R. Tolkien', 'title': 'The Lord of the Rings', 'isbn': '0-395-19395-8', 'price': 22.99}]登录后复制
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