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This article mainly introduces "how to use Python to parse JSON". In daily operation, I believe many people have doubts about how to use Python to parse JSON. Xiaobian consulted all kinds of data and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubt of "how to use Python to parse JSON". Next, please follow the editor to study!

JSON (JavaScript Object Notation) is a lightweight data exchange format. Json module can be used in Python3 to encode and decode JSON data, which mainly includes the following four operation functions:

Tip: the so-called class file object refers to those objects that have read () or write () methods, for example, f = open ('a.txt class ()), where f has the read () method, so f is the class file object.

During the encoding and decoding of json, the original type of python and the type of JSON will be converted to each other. The specific conversion comparison is as follows:

Python encodes to JSON type conversion corresponding table:

PythonJSONdictobjectlist, tuplearraystrstringint, float, int- & float-derived EnumsnumberTruetrueFalsefalseNonenull

JSON decodes to Python type conversion corresponding table:

JSONPythonobjectdictarrayliststringstrnumber (int) intnumber (real) floattrueTruefalseFalsenullNone

Example of operation:

Import json data = {'name':' pengjunlee', 'age': 32,' vip': True, 'address': {' province': 'GuangDong',' city': 'ShenZhen'}} # convert Python dictionary type to JSON object json_str = json.dumps (data) print (json_str) # result {"name": "pengjunlee", "age": 32, "vip": true "address": {"province": "GuangDong", "city": "ShenZhen"} # convert the JSON object type to the Python dictionary user_dic = json.loads (json_str) print (user_dic ['address']) # result {' province': 'GuangDong',' city': 'ShenZhen'} # output the Python dictionary directly to the file with open (' pengjunlee.json','w') Encoding='utf-8') as f: json.dump (user_dic, f, ensure_ascii=False, indent=4) # converts the JSON string in the class file object directly into the Python dictionary with open ('pengjunlee.json',' ringing, encoding='utf-8') as f: ret_dic = json.load (f) print (type (ret_dic)) # result print (ret_dic ['name']) # result pengjunlee

Note: simple string and Python type conversions can be achieved using eval ().

User1 = eval ('{"name": "pengjunlee"}') print (user1 ['name']) # as a result of pengjunlee, the study on "how to use Python to parse JSON" is over, hoping to solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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