json_dict.py

# standard libraries
import os
import sys
import json
import traceback


class JSONDict(dict):
    def __init__(self, file_path, sort_keys=False, *args, **kwargs):
        super(JSONDict, self).__init__(*args, **kwargs)
        self.file_path_ = file_path
        self.sort_keys_ = sort_keys

        if os.path.exists(file_path):
            try:
                with open(self.file_path_) as raw:
                    data = json.load(raw)
                self.update(data)

            except (WindowsError, IOError) as error_:
                exc_info = sys.exc_info()
                traceback.print_exception(*exc_info)
                del exc_info
        else:
            try:
                open(self.file_path_, "w+")

            except (WindowsError, IOError) as error_:
                exc_info = sys.exc_info()
                traceback.print_exception(*exc_info)
                del exc_info

    def __getattr__(self, item):
        return self.get(item)

    def __setitem__(self, key, value):
        super(JSONDict, self).__setitem__(key, value)
        self.__update_json__()

    def __delitem__(self, key):
        super(JSONDict, self).__delitem__(key)
        self.__update_json__()

    def clear(self):
        super(JSONDict, self).clear()
        self.__update_json__()

    def update(self, other, **kwargs):
        super(JSONDict, self).update(other)
        self.__update_json__()

    def __update_json__(self):
        try:
            if os.access(self.file_path_, os.W_OK):

                with open(self.file_path_, "w") as file_path_:
                    json.dump(self, file_path_, sort_keys=self.sort_keys_, indent=2)
            else:
                return

        except (WindowsError, IOError) as error_:
            exc_info = sys.exc_info()
            traceback.print_exception(*exc_info)
            del exc_info