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JSON (JavaScript Object Notation) is a lightweight data exchange format. Easy for humans to read and write. It is also easy for machines to parse and generate. It is based on JavaScript Programming Language, a subset of Standard ECMA-262 3rd Edition - December 1999. JSON uses a completely language-independent text format, but also uses conventions similar to the C language family (including C, C, C#, Java, JavaScript, Perl, Python, etc.). These properties make JSON an ideal data exchange language.
A collection of name/value pairs. In different languages, it is understood as an object, a record, a struct, a dictionary, a hash table, a keyed list, or an associative array. array).
An ordered list of values. In most languages, it is understood as an array.
When operating JSON in Python, you need to introduce the json standard library.
import json
Type conversion
Python type conversion to JSON:
json. dump()
#1. Python dict type to JSON
person_dict = {'name': 'pig', 'age': 18, 'sex': 'man', ' hometown': 'Jiangxi Fuzhou'}
dict, indent=4)print(person_obj_json, '\n')
JSON to Python type:json.loads( )
person_json_dict = json.loads(person_json)print(type(person_json_dict), '\n')
person_json_list = json.loads(person_json2)print(type( person_json_list), '\n')
Python and JSON data type correspondence table
Python | |
---|---|
array | |
string | |
number | |
true, false | |
null | |
JSON key names and strings must be enclosed in double quotes, and Single quotes in Python can also be expressed as strings, so this is a relatively easy mistake to make!
When converting Python types to JSON, should we use load/dump or loads\dumps? The method without adding s has an additional parameter fp representing filepath, and finally an additional operation of writing a file. So when we remember, we can remember it like this: Adding s means converting to a string (str), not adding s means converting to a file.Related recommendations:
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