Parse json file and make it available after initialization?

Question

Python

Hello, I have been learning python for a couple of days. The question is:
I have a json config file. There is a base class that also collects information from configs. How can I, after initialization, store information somewhere without parsing this file again. I would like to import this class and just refer to it as an array. How to do it?

Answer 1

The pattern is called a singleton.

class EnvironmentSetup(unittest.TestCase):
    base_config = None

    @classmethod
    def setUpClass(cls):
        cls.base_config = cls.setConfig()

    @classmethod
    def setConfig(cls):
        with open('../config.json') as file:
            config = json.load(file)
        return config

    def __new__(cls):
        # Перекрываем создание объекта класса
        if not hasattr(cls, 'instance'):
            cls.instance = super().__new__(cls)
        return cls.instance

tu and at init do all things

Answer 2

You probably parse it with regular expressions, while all normal people use the json library.
the function just parses it into a variable of type dict or list (it depends on the content) and then you access it as a dictionary array.config=json.load(open("config.json"))

>>>config["myint"]
1
>>>config["mystring"]
'string'
>>>config["myarray"][0]
'item1'

you can parse into a variable that is visible in all functions and then access it.
PS I store local mini databases in json - if you want to download, process, save. Very comfortably.

Answer 3

Class 1 (initializing)

class EnvironmentSetup(unittest.TestCase):
    base_config = None

    @classmethod
    def setUpClass(cls):
        cls.base_config = cls.setConfig()

    @classmethod
    def setConfig(cls):
        with open('../config.json') as file:
            config = json.load(file)
        return config

Class 2

from tests.base.test import EnvironmentSetup as base_test
class Another:
    def __init__(self, params):
        print(base_test.base_config)  -> Получаю None соответственно