python实例27[json]-优快云博客

本文深入探讨了JSON的基本语法及其在Python中的应用，通过一个具体实例展示了如何使用Python的json模块进行序列化和反序列化操作。

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一 Json

http://json.org/

json语法：

1） string：value 可以看做是json的最小单位，json由string:value的集合组成，其中value中可以嵌套string:value；

2） string为双引号包围的unicode字符串，特殊符号需要\来转义；

3） value可以为string:value，array，string，number，true，false，null；

一个实例：

{

"firstName":"John",

"lastName" :"Smith",

"adress":{

"streetAddress":"21 2nd Street",

"city":"New York",

"state":"NY",

"postalCode":10021

"phoneNumbers":[

"212 555-1234",

"646 555-4567"

]

}

二 python 与 json

三 python的json模块

import json

testStr = '''
{
"firstName":"John",
"lastName" :"Smith",
"adress":{
  "streetAddress":"21 2nd Street",
  "city":"New York",
  "state":"NY",
  "postalCode":10021
  },
"phoneNumbers":[
  "212 555-1234",
  "646 555-4567"
  ]
}
'''

# Deserialize s (a str or unicode instance containing a JSON document) to a Python object.
obj = json.loads(testStr)

print( " firstName: " + obj[ " firstName "])
print( " city: " + obj[ " adress "][ " city "])
print( " phoneNumbers: " + str(obj[ " phoneNumbers "]))

# Serialize obj to a JSON formatted str.
str = json.dumps(obj,indent=2)
print(str)

the output:
firstName:John
city:New York
phoneNumbers:[u ' 212 555-1234 ', u ' 646 555-4567 ']
{
   " lastName ": " Smith ",
   " phoneNumbers ": [
     " 212 555-1234 ",
     " 646 555-4567 "
  ],
   " adress ": {
     " postalCode ": 10021,
     " city ": " New York ",
     " streetAddress ": " 21 2nd Street ",
     " state ": " NY "
  },
   " firstName ": " John "
}

完!