I never thought much about best implementation because I only used it i think once in ten years. But afaik I used something like this, that does the job and is

I never thought much about best implementation because I only used it i think once in ten years. But afaik I used something like this, that does the job and is easy to read _empty = object() def deep_get(dct, dotted_path, default=_empty): for key in dotted_path.split('.'): try: dct = dct[key] except KeyError: if default is _empty: raise return default return dct