JSON modules in Python

I. What is JSON

1. JSON is the abbreviation for JavaScript Object notation, which is a data interchange format

2. Essence is a string, is the string representation of the JS object

3. Similar to the dictionary in Python, but there are some grammatical differences

• No value of None, only null value

• Encoding format for Utf-8

• The string must be double-quoted to express the

4. The string in Python is to be converted to a JSON object, using the JSON library to complete

two. Import the JSON module

Import JSON

Three. Common methods for JSON modules1. Json.dumps (str, indent=4, sort_keys=true) converts a Python data object into a JSON string

• Indent: Format output JSON data, rendering more intuitive. Indent=4 indicates indentation of 4 spaces

• Sort_keys:json strings are sorted by key in the dictionary

2. Json.loads () converts a JSON string into a Python object, such as a JSON string converted to a list, a dictionary

Four. ExampleExample 1

ImportJSON#convert a Python object to a JSON stringA = {"name":"Xiaozhai","Sex": None}b=Json.dumps (a)Print(b)Print(type (b))#convert a JSON string into a python dictionaryc =Json.loads (b)Print(c)Print(Type (c))

Run results

{"name":"Xiaozhai","Sex": null}<class 'Str'>{'name':'Xiaozhai','Sex': None}<class 'Dict'>

Note: The print () function saves quotes and prints in order to produce better-readable output, and if we do not print () in Python's own idle, we see better results

the role of indent in instance 2:json.dumps () is to indent spaces, Sorted_keys will be sorted by the first letter of key in the dictionary

Import JSON # converts a Python object to a JSON string a = {"name""Xiaozhai" "  sex"= Json.dumps (A, indent=4, sort_keys=True)print (b) Print (type (b))

Run results

{    "name""xiaozhai",    "  sex": null}<class'str' >

Five. Appendix1. Python Primitive type conversion table to JSON type

Python	Json
Dict	Object
List, tuple	Array
STR, Unicode	String
int, long, float	Number
True	True
False	False
None	Null

2. Conversion Chart of JSON type to Python type

Json	Python
Object	Dict
Array	List
String	Unicode
Number (int)	int, long
Number (real)	Float
True	True
False	False
Null	None

Reference Articles

Http://www.runoob.com/python/python-json.html

Https://www.liaoxuefeng.com/wiki/001434446689867b27157e896e74d51a89c25cc8b43bdb3000/ 001434499490767fe5a0e31e17e44b69dcd1196f7ec6fc6000

JSON modules in Python