Step1

cfg = {
    'level1_1': {
        'level1_2': {
            'level1_3': {
                'level1_4': {
                    'item1': 10,
                    'item2': 20,
                }
            }
        }
    }
}


class Cache:
    def __init__(self, **data):
        self.data = data

    def get(self, uri=None):
        if not uri:
            return self.data
        elif uri in self.data:
            return self.data[uri]

    def set(self, uri, value=None):
        self.data[uri] = value


c = cache = Cache(**cfg)

print(c.get())
c.set('abc', 123)
print(c.get('abc'))