Python3 JSON Data parsing

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

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:

#!/usr/bin/python3import json# Python dictionary type converted to JSON object data = {    ' no ': 1,    ' name ': ' W3cschool ',    ' url ': '/http ' www.w3cschool.cn '}json_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.w3cschool.cn ', ' No ': 1, ' name ': ' W3cschool '}json object: {' URL ': ' http://www.w3cschool.cn ', "No": 1, "name": "W3cschool"}

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:

#!/usr/bin/python3import json# Python dictionary type converted to JSON object data1 = {    ' no ': 1,    ' name ': ' W3cschool ',    ' url ': ' http:/ /www.w3cschool.cn '}json_str = Json.dumps (data1) print ("Python raw Data:", repr (data1)) print ("JSON object:", JSON_STR) # will JSON object Convert to 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:

Ython raw data: {' name ': ' W3cschool ', ' No ': 1, ' url ': ' http://www.w3cschool.cn '}json object: {' name ': ' W3cschool ', ' No ': 1, ' URL ': "http://www.w3cschool.cn"}data2[' name ':  w3cschooldata2[' url ']:  http://www.w3cschool.cn

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:

# Write JSON data with open (' Data.json ', ' W ') as F:    json.dump (data, f) # Read data with open (' Data.json ', ' R ') as F:    data = JSO N.load (f)

Python3 JSON Data parsing