Python读写json文件

　　json模块封装了json的读写操作,提供了以下4个函数:

dumps: 将一个Python对象编码为json对象

loads:　将一个json对象解析为Python对象

dump:　写入json文件

load:　   读取json文件 

下面介绍读取json文件

一 创建config.json文件如下:

[
{"symbol":"M2101","Internal":"60m","Trend":"upward","fast_window":"10","slow_window":"20"},
{"symbol":"FG2101","Internal":"60m","Trend":"downward","fast_window":"10","slow_window":"20"}
]

二 创建代码文件ReadJson.py如下:

import json


with open('./config.json', 'r') as f:
    datas = json.load(f)#datas是字典对象

    for data in datas:
        print("symbol", data['symbol'], "  Trend  ", data['Trend'])

三 运行

　　cmd.exe中执行python ReadJson.py命令,结果如图: