Recently, I write an interpreter for subset of Python using Go. I haven't seen source code of CPython, all is just written according to my understanding of Python so there may be some unusual things. Hope you can play fun with it. Any suggestion is welcome, glad to get some feedback.
You might also want to take look at Starlark, which has a Go implementation: <a href="https://github.com/google/starlark-go">https://github.com/google/starlark-go</a>
It's such a small subset that it would more accurately be described as a scripting language with syntax similar to python for single file scripts.
Another python implementation in golang:<p><a href="https://github.com/go-python/gpython">https://github.com/go-python/gpython</a>