get_deep_key.py

    def get(self, key, fallback):
        if key == None:
            return fallback
        else:
            node = self.obj
            keys = key.split('.').reverse()
            while(len(keys)):
                k = keys.pop()
                try:
                    tmp = int(k)
                    k = tmp
                except ValueError: pass
                node = node[k]
            if node == None:
                return fallback
            else:
                return node