lispc

As I said, you can make a version of Python that uses s-expressions without changing anything else about the language. You can even give that same treatment to C! Python is also perfectly capable of manipulating s-expressions at runtime. (It's much more of a hassle in C. But that's because almost everything is more of a hassle in C.) Homoiconicity is fun, but it's not a very deep property of your favourite language. See https://github.com/eratosthenesia/lispc for someone making a C with s-expression syntax.