You're probably thinking of jsobject¹: from jsobject import Object foo = Object() foo.x = 1 foo.a = {} # foo.a.b will fail without this line

You're probably thinking of jsobject¹: from jsobject import Object foo = Object() foo.x = 1 foo.a = {} # foo.a.b will fail without this line foo.a.b = 2 print(foo) # prints: {'a': {'b': 2}, 'x': 1} ¹ https://pypi.python.org/pypi/jsobject/ https://pypi.python.org/pypi/jsobject/