python json模块

json 模块提供了一种很简单的方式来编码和解码JSON数据。其中两个主要函数是

json.dumps()和json.loads(),


字典转json:

import json
data ={
    'name':'111',
    'shares':'222',
    'price':'3333'
}
print data
print type(data)
json_str=json.dumps(data)
print json_str
print type(json_str)

C:Python27python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/Django/a40.py
{'price': '3333', 'name': '111', 'shares': '222'}
<type 'dict'>
{"price": "3333", "name": "111", "shares": "222"}
<type 'str'>

JSON 编码支持的基本数据类型为None,bool,int,float和str,以及包含这些类型数据的lists,tuples和字典


为了遵循JSON规范，你应该只
编码Python的lists和dictionaries。 而且，在web应用程序中，顶层对象被编码为一个字典
是一个标准做法。

列表转换为Json

import json
data=['a','b','c']
print data
print type(data)
json_str=json.dumps(data)
print json_str
print type(json_str)



C:Python27python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/Django/a40.py
['a', 'b', 'c']
<type 'list'>
["a", "b", "c"]
<type 'str'>

JSON 编码的格式对于Python语法几乎是完全一样的,除了一些小的差异之外。

比
如，True会被映射为true，False被映射为false，而None会被映射为null。 下面是一个例
子，演示了编码后的字符串效果：

import json
d={'a':True,
   'b':'Hello',
    'c':None,
     'd':False}
print json.dumps(d)

C:Python27python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/Django/a40.py
{"a": true, "c": null, "b": "Hello", "d": false}


# !/usr/bin/env python
# -*- coding: utf-8 -*-
import json
import urllib
import urllib2
url = "https://www.zjcap.cn/web/noauth?productSn=1079&method=%2Fproduct%2Fdetail&platform=web&_=1509514340879"
req = urllib2.Request(url)
print req
print type(req)

res_data = urllib2.urlopen(req)
res = res_data.read()
print res
print '-------type------'
#类型为json
print type(res)


C:Python27python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/Django/a40.py
<urllib2.Request instance at 0x025B2620>
<type 'instance'>
{"data":{"bonus":0.0100000000,"buyToTime":"2017-10-31 16:00:00","precision":0,"buyToTimeMillis":1509436800000,"containBonus":"2","wzeCardYield":0E-10,"realValueStartDate":"2017-10-31","naturalSeasonRepaymentDay":0,"createdTime":"2017-10-31 11:07:45","showType":"2","supportCouponType":"","bonusType":"1","realValueEndDate":"2017-12-27","allowInvest":1,"unitValue":1.0000000000,"quotaForFirst":0,"assignTypeCode":1,"displayText":"1.00%","buyFromTime":"2017-10-31 11:06:00","yieldForFirst":0E-10,"delegator":"浙江省对外经济贸易投资有限公司","repaymentInterval":0,"custody":"中均资产管理有限公司","settlementDate":"2017-12-28","financeType":"1","name":"中均-尊享534号","totalQuota":4510000,"status":4,"realSettlementDate":"2017-12-28","buyAcctTypes":"1","isOnlyForFirst":"1","wzeCardYieldOnOff":"2","remark":"“中均-尊享534号”预期借款利率达7%/年（外加红包），期限预计为58个自然日，借款用途为补充该企业生产经营所需流动资金。","addUnit":10000,"supportStock":2,"accessType":1,"duration":58,"yield":0.0800000000,"maxUnit":5000000,"sn":1079,"productType":"3","daysOfYear":360,"riskInfo":"","buyFromTimeMillis":1509419160000,"assignType":"一次性还本付息","valueStartDate":"2017-10-31","stageNum":1,"progress":1.0000,"remainQuota":0,"entryUnit":1000000,"serverTimeMillis":1509520371647,"activityType":0,"valueEndDate":"2017-12-27"},"retCode":"0000","retMsg":"查询成功"}
-------type------
<type 'str'>





python 解json:
# !/usr/bin/env python
# -*- coding: utf-8 -*-
from pprint import pprint
import json
import urllib
import urllib2
url = "https://www.zjcap.cn/web/noauth?productSn=1079&method=%2Fproduct%2Fdetail&platform=web&_=1509514340879"
req = urllib2.Request(url)
print req
print type(req)

res_data = urllib2.urlopen(req)
res = res_data.read()
print res
print '-------type------'
#类型为json
print type(res)
print '-------json--------'
r=json.loads(res)
print r
print type(r)
print r['data']['remark']


下面如何将一个JSON字典转换为一个Python对象例子: