JSONPath是一種信息抽取類庫(kù)，是從JSON文檔中抽取指定信息的工具，提供多種語(yǔ)言實(shí)現(xiàn)版本，包括Javascript、Python、PHP和Java。

JSONPath的安裝方法如下:

pip install jsonpath

下面使用一個(gè)JSON文檔演示JSONPath的具體使用。JSON 文檔的內(nèi)容如下：

{
  "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
    }
  }
}

假設(shè)變量bookJson中已經(jīng)包含了這段JSON字符串，可通過(guò)以下代碼反序列化得到JSON對(duì)象：

books=json.loads(bookJson)

checkurl = "$.store.bicycel.color"
print(jsonpath.jsonpath(books, checkurl))
# 輸出：['red']

（2）輸出book節(jié)點(diǎn)中包含的所有對(duì)象：

checkurl = "$.store.book[*]"
object_list=jsonpath.jsonpath(books, checkurl)
print(object_list)

（3）輸出book節(jié)點(diǎn)的第一個(gè)對(duì)象：

checkurl = "$.store.book[0]"
obj = jsonpath.jsonpath(books, checkurl)
print(obj)
# 輸出: ['category': 'reference', 'author': 'Nigel Rees', 'title': 'Sayings of the Century', 'price': 8.95}]

（4）輸出book節(jié)點(diǎn)中所有對(duì)象對(duì)應(yīng)的屬性title值：

checkurl = "$.store.book[*].title"
titles = jsonpath.jsonpath(books, checkurl)
print(titles)
# 輸出: ['Sayings of the Century', 'The Lord of the Rings']

（5）輸出book節(jié)點(diǎn)中category為fiction的所有對(duì)象：

checkurl = "$.store.book[?(@.category=='fiction')]”
books=jsonpath.jsonpath(books, checkurl)
print(books)
# 輸出:[{'category': 'fiction', 'author': 'J. R. R. Tolkien', 'title': 'The Lordof the Rings', 'isbn': '0-395-19395-8'， 'price': 22.99}]

（6）輸出book節(jié)點(diǎn)中所有價(jià)格小于10的對(duì)象：

checkurl="$.store.book[?(@.price<10)]"
books = jsonpath.jsonpath(books, checkurl)
print(books)
# 輸出: [{'category': 'reference', 'author': 'Nigel Rees', 'title':'Sayings of the Century', 'price': 8.95}]

（7）輸出book節(jié)點(diǎn)中所有含有isb的對(duì)象：

checkurl = "$.store.book[?(@.isb)]"
books = jsonpath.jsonpath(books，checkurl)
print(books)
# 輸出: [{'category': 'fiction', 'author': 'J. R. R. Tolkien', 'title': 'The Lord of the Rings', 'isbn': '0-395-19395-8'， 'price': 22.99}]

猜你喜歡：

python中join的用法介紹

Python os.listdir()函數(shù)用法介紹

Python內(nèi)置模塊怎么刪除和創(chuàng)建目錄？

黑馬程序員python+大數(shù)據(jù)培訓(xùn)課程