JSON基础

json是存储和交换文本信息的语法，和XML类似

json比xml更小，更快，更容易解析

json实例：

{
"shidong": [
{ "name":"百度" , "url":"www.baidu.com" },
{ "name":"google" , "url":"www.google.com" },
{ "name":"微博" , "url":"www.weibo.com" }
]
}

sites对象包含了三个对象

json指的是JavaScript对象表示法

json是轻量级的文本数据交换格式

 

 

#!/usr/bin/env python
# encoding: utf-8
import json
from pprint import pprint
info_string = """{
  "name":"shidong",
  "age":24,
  "coding skills":["python","matlab","java","c","c++","Ruby","shell"],
  "ages for school":{
    "primary school":6,
    "middle school":9,
    "high school":15
  },
  "hobby":["sports","reading"],
  "married":false
}
"""

info = json.loads(info_string)#利用json.loads（）方法从字符串中读取json数据
pprint(info)
print(type(info))
#也可以使用json.dumps()将一个Python对象编程Json对象：
# info_json = json.dumps(info)
# print(info_json)
# print(type(info_json))

#把对象保存为json文件
with open("info.json","w") as f:
    json.dump(info,f)
#查看info.json的内容
with open("info.json") as f:
    print(f.read())

#从文件中读取数据
with open("test.json") as f:
    info_from_file = json.load(f) #jsoan.load()从文件中读取数据
pprint(info_from_file)