Python read-write JSON file (dump, load), and data processing in JSON format (dumps, loads)

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

1, Json.dumps () and json.loads () are JSON format processing functions (so to understand, JSON is a string)

1. The Json.dumps () function is an encoding of a Python data type list in JSON format (so you can understand that the json.dumps () function converts a dictionary to a string)
2. The Json.loads () function converts the JSON format data to a dictionary (as you can understand, the json.loads () function converts a string into a dictionary)

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

2, Json.dump () and Json.load () are mainly used to read and write JSON file functions

Examples are as follows:

ImportJson,time#save data to JSON filedefStore (data): With open ('Data.json','W') as FW:#Convert a dictionary to a string        #json_str = json.dumps (data)        #fw.write (JSON_STR)        #the above two sentences are equivalent to the following sentencejson.dump (DATA,FW)#load JSON data from filedefload (): With open ('Data.json','R') as F:data=json.load (f)returnDataif __name__=="__main__": Json_data='{"Login": [{"username": "AA", "Password": "001"},{"username": "BB", "Password": "002"}], "register": [{"username": "CC", "Password": "003"},{"username": "dd", "Password": "004"}]}'    #function is to convert JSON formatted data into a dictionarydata =json.loads (Json_data) store (data) data=load ()Print(data)

Summarize:

Used for manipulating files without s, with s for conversion of data types.

Python read-write JSON file (dump, load), and data processing in JSON format (dumps, loads)