What is JSON

JSON (JavaScript Object Notation) is a lightweight data interchange format. It is based on a subset of ECMAScript.

The JSON has these forms:

An object is an unordered collection of "name/value pairs". An object starts with "{" (opening parenthesis) and "}" (the closing parenthesis) ends. Each "name" is followed by a ":" (colon); "' Name/value ' pair ' is separated by", "(comma).

The JSON module can be used to encode JSON data in Python3, which contains two functions:

• json.dumps (): encodes the data.
• json.loads (): decodes the data.

In the JSON encoding and decoding process, the original Python type and JSON type will be converted to each other, the specific conversions against the following:

Python encoding is a JSON type conversion table:

Python	JSON
Dict	Object
List, tuple	Array
Str	String
int, float, int-& float-derived Enums	Number
True	True
False	False
None	Null

JSON decodes the corresponding table for the Python type conversion:

JSON	Python
Object	Dict
Array	List
String	Str
Number (int)	Int
Number (real)	Float
True	True
False	False
Null	None

Json.dumps and Json.loads instances

The following example demonstrates the conversion of a PYTHON data structure to JSON:

1 #!/usr/bin/python32 3 ImportJSON4 5 #Python dictionary type converted to JSON object6data = {7     'No': 1,8     'name':'Runoob',9     'URL':'http://www.runoob.com'Ten } One  AJson_str =json.dumps (data) - Print("Python raw Data:", repr (data)) - Print("JSON object:", JSON_STR)

Execute the above code to output the result:

Python Raw data: {‘Url: ' Http://www.runoob.com ',  ' no ' :  1,  ' name ' :  ' Runoob ' }json  object:  {< span class= "str" > "url" :  "HTTP +/" Www.runoob.com ", " no ":  1,  "name" : } 
      

The result of the output shows that the simple type is very similar by encoding followed by its original repr () output.

Next, we can convert a JSON-encoded string back to a python data structure:

1 #!/usr/bin/python32 3 ImportJSON4 5 #Python dictionary type converted to JSON object6Data1 = {7     'No': 1,8     'name':'Runoob',9     'URL':'http://www.runoob.com'Ten } One  AJson_str =json.dumps (data1) - Print("Python raw Data:", repr (data1)) - Print("JSON object:", Json_str) the  - #Convert a JSON object to a Python dictionary -Data2 =json.loads (JSON_STR) - Print("data2[' name ']:", data2['name']) + Print("data2[' url ']:", data2['URL'])

Execute the above code to output the result:

Python Raw data: {‘Name: ' Runoob ', ' No ': 1, ' URL ': ' Http://www.runoob.com '}Json { "name" :  "Runoob" ,  "No" : 1,  "url" :  "http://www.runoob.com" }data2[ ' name ' ]: runoobdata2[ ' URL ' ]: Http://www.runoob.com 
    

If you are dealing with files instead of strings, you can use json.dump () and json.load () to encode and decode JSON data. For example:

1 #Writing JSON Data2With open ('Data.json','W') as F:3 json.dump (data, F)4 5 #reading Data6With open ('Data.json','R') as F:7data = Json.load (f)

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Copy from: /HTTP/ www.runoob.com/python3/python3-json.html

The more refer to:https://docs.python.org/3/ library/json.html

What's JSON