Python—JSON数据解析 - xiaowenhui

Python—JSON数据解析

1.安装pip

pip是python的包管理工具，使用它能非常方便地安装和卸载各种python工具包

第一步：直接用浏览器访问地址：https://raw.github.com/pypa/pip/master/contrib/get-pip.py，直接打开了get-pip.py的源代码，可以直接把内容拷贝出来，然后在本地创建get-pip.py

第二步：控制台进入到get-pip.py所在目录，运行代码：

python get-pip.py

pip默认安装实在当前版本python目录的script下，所以将此目录设置到环境变量path中即可，我的目录是 C:\Python27\Scripts

2.安装demjson模块

 windows下，打开cmd控制台窗口，使用pip命令安装，命令如下：

pip install demjson

 

3.json字符串和python对象之间转换的示例代码如下

# -*- coding:UTF-8 -*-
\'\'\'
Created on 2015年9月14日

@author: xiaowenhui
\'\'\'

import demjson

\'\'\'
encode：编码，将python对象编码成JSON字符串
decode:解码，将JSON字符串解码成python对象
\'\'\'

data1 = [ { \'a\' : 1, \'b\' : 2, \'c\' : 3, \'d\' : 4, \'e\' : 5 } ]
json1 = demjson.encode(data1)
print json1

json2 = \'{"a":1,"b":2,"c":3,"d":4,"e":5}\'
data2 = demjson.decode(json2)
print data

json3 = "{\'Transformers\': {\'rating\': \'R\', \'description\': \'A schientific fiction\', \'format\': \'DVD\', \'stars\': \'8\', \'year\': \'1989\', \'type\': \'Anime, Science Fiction\'}, \'Ishtar\': {\'rating\': \'PG\', \'type\': \'Comedy\', \'description\': \'Viewable boredom\', \'stars\': \'2\', \'format\': \'VHS\'}, \'Enemy Behind\': {\'rating\': \'PG\', \'description\': \'Talk about a US-Japan war\', \'format\': \'DVD\', \'stars\': \'10\', \'year\': \'2003\', \'type\': \'War, Thriller\'}, \'Trigun\': {\'rating\': \'PG\', \'description\': \'Vash the Stampede!\', \'format\': \'DVD\', \'episodes\': \'4\', \'stars\': \'10\', \'type\': \'Anime, Action\'}}"
data3 = demjson.decode(json3)
print data3

　

输出结果如下：

[{"a":1,"b":2,"c":3,"d":4,"e":5}]
[{\'a\': 1, \'c\': 3, \'b\': 2, \'e\': 5, \'d\': 4}]
{u\'Enemy Behind\': {u\'rating\': u\'PG\', u\'description\': u\'Talk about a US-Japan war\', u\'format\': u\'DVD\', u\'stars\': u\'10\', u\'year\': u\'2003\', u\'type\': u\'War, Thriller\'}, u\'Ishtar\': {u\'rating\': u\'PG\', u\'type\': u\'Comedy\', u\'description\': u\'Viewable boredom\', u\'stars\': u\'2\', u\'format\': u\'VHS\'}, u\'Transformers\': {u\'rating\': u\'R\', u\'description\': u\'A schientific fiction\', u\'format\': u\'DVD\', u\'stars\': u\'8\', u\'year\': u\'1989\', u\'type\': u\'Anime, Science Fiction\'}, u\'Trigun\': {u\'rating\': u\'PG\', u\'description\': u\'Vash the Stampede!\', u\'format\': u\'DVD\', u\'episodes\': u\'4\', u\'stars\': u\'10\', u\'type\': u\'Anime, Action\'}}