json_file_io

import json
from os.path import exists


class JsonFileIo:
    def __init__(self, *, file_name=None):
        if file_name is None:
            raise "You must provide file_name!"

        # if not exists(file_name):
        #    raise "File missing!"


        self.__file_name = file_name    # Превръщане на името на файла в свойство на обекта !


    def read_content(self):

        if not exists(self.__file_name):
            return None

        with open(self.__file_name, 'r', encoding="utf-8") as json_f:
            content = json.load(json_f)

        return content

    def write_content(self, data):
        #conv_json = json.dumps(data, ensure_ascii=False)
        with open(self.__file_name, 'w', encoding="utf-8") as json_file:
            json.dump(data, json_file,ensure_ascii=False)


if __name__ == "__main__":
    f1 = JsonFileIo(file_name="filename")
    data = f1.read_content()
    f1.write_content(data)