DottedDict replacement

ddict.py

#!/usr/bin/env python3
'''
Simple dict with dot-syntax access to its data.
Mostly for configs (the keys are already known).

Example:
    cfg = DottedDict().load_json('config.json')
    print(cfg.application.db.name)
'''
from collections import UserDict
import json


class DottedDict(UserDict):
    def __getattr__(self, name):
        return self.data[name]

    def _set(self, dct):
        self.clear()
        self.update(dct)
        return self

    def from_json(self, text):
        return self._set(json.loads(text, object_hook=self.__class__))

    def load_json(self, source):
        if hasattr(source, 'read'):
            return self._set(json.load(source, object_hook=self.__class__))
        if isinstance(source, str):
            with open(source) as fp:
                return self._set(json.load(fp, object_hook=self.__class__))
        raise NotImplementedError(f'Cannot load JSON from {source!r} of {type(source)!r}')

    def __str__(self):
        return json.dumps(self.data,
                          indent=2,
                          ensure_ascii=False,
                          default=lambda o: o.data if isinstance(o, UserDict) else o)


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