23.23. Python JSON conversion

JSON ==> Javascript Object Notation

AJAX is a form of key:value.

There are four methods of JSON:

Json.loads

Json.dumps

Understanding: Plus S is used to handle strings.

Json.load

Json.dump

Understanding: Not adding S is used to process the file

Load or loads

Convert JSON to other objects, strings, or file-related.

Dump or dumps

To convert another object or format into a JSON format

1. Conversion between strings and JSON

Example 1: Converting a Python dictionary format into a JSON string format

>>> a = dict (name= ' Linan ', age= ' + ', message= ' yes ') >>> print a{' message ': ' Yes ', ' age ': ' + ', ' name ': ' Linan '}>>> print type (a) <type ' dict ' >>>> import json>>> b=json.dumps (a) >>> Print b{"message": "Yes", "age": "All", "name": "Linan"}>>> print type (b) <type ' str ' >

Print A and print B are the same, but the format has changed

https://www.json.cn/ This site supports JSON parsing

Example 2: Converting a string into a dictionary

>>> C = json.loads (b) >>> print c{u ' message ': U ' yes ', U ' age ': U ' ", U ' name ': U ' linan '}>>> prin T type (c) <type ' Dict ' >

2. Conversion between file and JSON

The load must have been out of the file. JSON data, converted to JSON data

Dump is the writing of JSON data to a file

Converts a string to a file in JSON format

Import jsonjsondata= ' {' A ': 1, ' B ': 2, ' C ': 3, ' d ': 4, ' E ': 5} ' ' # #字符串文件内写成三引号或者单引号with open (' A.txt ', ' W ') as F:json.dump ( Jsondata, F)

Results

The contents of the A.txt file are as follows:

"{\" a\ ": 1,\" b\ ": 2,\" c\ ": 3,\" d\ ": 4,\" e\ ": 5}"

Therefore, Json.dump () can write JSON data directly to the file.

Converts the contents of a JSON-formatted file into a string

With open (' A.txt ', ' R ') as Fr:m = Json.load (FR) print (m) print (Type (m))

Results

{"A": 1, "B": 2, "C": 3, "D": 4, "E": 5}

<type ' Unicode ' >

So, the Json.load () bar file content is converted to a Unicode data type to return

This article is from the "Note space" blog, so be sure to keep this source http://286577399.blog.51cto.com/10467610/1981382

23.23. Python JSON conversion