A simple inheriting dictionary implementation written in Python, with some inspiration taken from EmberJS' internals.

gistfile1.py

import collections


class InheritDict(collections.UserDict):
    def __init__(self, data, parent=None):
        for k, v in data.items():
            if isinstance(data[k], dict):
                data[k] = InheritDict(data[k], self)

        super().__init__(data)

        self.parent = parent

    def __getitem__(self, key):
        try:
            return self.data[key]
        except KeyError:
            if self.parent:
                return self.parent[key]
            else:
                raise

data = {
    'repository': 'url',
    'web': {
        'conf': 'lol',
        'google': {
            'conf': 'overwrites lol'
        },
        'bing': {}
    }
}

d = InheritDict(data)

assert d['repository'] == 'url'
assert d['web']['conf'] == 'lol'
assert d['web']['google']['conf'] == 'overwrites lol'
assert d['web']['bing']['conf'] == 'lol'