Sweet-expressions is a cool idea. Was it Python that started the whitespace-is-significant trend? I'm wondering why someone doesn't create a Scheme or a Lisp wi

Sweet-expressions is a cool idea. Was it Python that started the whitespace-is-significant trend? I'm wondering why someone doesn't create a Scheme or a Lisp with this as valid syntax out of the box. I think you'd still need to support regular S-expressions though, right?