jsonpath.py

def get_path(json, path, default=None):
	cur, _, rest = path.partition(".")
	if cur in json:
		if len(rest) > 0:
			return get_path(json[cur], rest)
		else:
			return json[cur]
	return default


if __name__ == "__main__":
	assert get_path({"foo": {"bar": 42}}, "foo.bar") == 42
	assert get_path({"foo": "bar"}, "foo") == "bar"
	assert get_path({}, "foo") == None
	assert get_path({}, "foo", "bar") == "bar"