Python3 JSON file operation

JSON functions

Before using JSON functions, you first need to import the JSON module, the import JSON

1), Json.dumps () function

This function encodes a Python object into a JSON string, for example:

1 ImportJSON2d={'Qian':{'Sex':'male','Addr':'Beijing',' Age': 34},'Chin':{'Sex':'female','Addr':'Beijing',' Age': 34},}                  3 Print(Json.dumps (d,ensure_ascii=false,indent=4))#The dictionary turns into JSON, the dictionary is converted to a string plus ensure_ascii=false, the Chinese is recognized, and the indent=4 is 4 spaces apart4 5 #The result of the above code conversion is:6 {7     "Qian": {8         "Sex":"male",9         "Addr":"Beijing",Ten         " Age": 34 One     }, A     "Chin": { -         "Sex":"female", -         "Addr":"Beijing", the         " Age": 34 -     } -}

2), Json.dump () function

This function allows you to encode a Python object into a JSON string and write it to the file yourself, without having to write the file separately, for example:

1 ImportJSON2d={'Qian':{'Sex':'male','Addr':'Beijing',' Age': 34},'Chin':{'Sex':'female','Addr':'Beijing',' Age': 34},}  3FW =open ('User_info.json','W', encoding='Utf-8')#open an empty file named ' User_info.json '4Json.dump (d,fw,ensure_ascii=false,indent=4)#The dictionary turns into JSON, the dictionary is converted to a string, and you do not need to write the file, you write the JSON string to the ' User_info.json ' file .

3), json.loads () function

The original contents of the document Product.json are as follows:

{    "iphone":{        "Color":"Red",        "Num": 1,        " Price": 98.5    },    "Wather":{        "Num": 100,        " Price": 1,        "Color":" White"    }}

Use the Json.loads () function to turn the JSON string into a Python data type:

1 ImportJSON2F =open ('Product.json', encoding='Utf-8')#Open the JSON file for ' Product.json '3Res=f.read ()#Read the file4 Print(Json.loads (RES))#change the JSON string to Python's data type: Dictionary5 6 #the results of the above conversions are:7{'iphone': {'Color':'Red','Num': 1,' Price': 98.5},'Wather': {'Num': 100,' Price': 1,'Color':' White'}}

4), Json.load () function

This function turns the JSON string into a Python data type: A dictionary, a file object, which will help you read the file, no need to read the file separately, for example:

ImportJSON F=open ('Product.json', encoding='Utf-8')#Open FilePrint(Json.load (f))#Turn the JSON string into Python data type: Dictionary, pass a file object, it will help you read the file, do not need to read the file separately#The result of the above conversion execution is:{'iphone': {'Color':'Red','Num': 1,' Price': 98.5},'Wather': {'Num': 100,' Price': 1,'Color':' White'}}

Python3 JSON file operation