Encoding and decoding of json format data in Python

The example in this article describes the encoding and decoding method of json format data in Python. Share it with everyone for your reference, the details are as follows:

Python has built-in processing methods for json data format starting from version 2.6.

1. json format data encoding

In python, json data format encoding uses the json.dumps method.

#!/usr/bin/env python
#coding=utf8
import json
users = [{'name': 'tom', 'age': 22}, {'name': 'anny', 'age': 18}]
#元组对象也可以
#users = ({'name': 'tom', 'age': 22}, {'name': 'anny', 'age': 18})
#输出[{"age": 22, "name": "tom"}, {"age": 18, "name": "anny"}]
print json.dumps(users)

where users can be a tuple object or a list object. The elements within the object can be numbers, strings, tuples, lists, None, and Boolean values.

#!/usr/bin/env python
#coding=utf8
import json
random = (5, [1, 2], "tom\" is good", (1, 2), 1.5, True, None)
#输出[5, [1, 2], "tom\" is good", [1, 2], 1.5, true, null]
print json.dumps(random)

2. Decoding json format data

In python, json format data decoding uses the json.loads method. Apply the above example:

#!/usr/bin/env python
#coding=utf8
import json
random = (5, [1, 2], "tom\" is good", (1, 2), 1.5, True, None)
jsonObj = json.dumps(random)
#输出[5, [1, 2], u'tom" is good', [1, 2], 1.5, True, None]
print json.loads(jsonObj)

Here is to first encode a data json, and then decode the encoded data. Logically speaking, the decoded data should be the same as the original data, but we found that the tuple objects here have been replaced with list objects. This involves the definition of data formats for conversion between python and json. Look at the following two pictures:

Convert python to json data format definition

Convert json to python data format definition

It can be seen from the above two figures that when python is converted to json, list and tuple will be converted to array, but when json is converted to python, array will only be converted to list.

Note: The content of the above two pictures comes from the python official website. The dumps method and loads method of json also have other parameters that can be used.

For more articles related to encoding and decoding json format data in Python, please pay attention to the PHP Chinese website!