I want to code in Scheme

But I don't really know how to write idiomatic code. Is anyone here willing to rewrite some of my python code, so I can see how it's done?

Also, what is the code-tag on this board?

As in, just fucking do it. Don't pussy-foot around. Write a program. If it's not idiomatic, who gives a shit? It's not going into production. Keep writing until it is comfortable-looking.