Hi, I was looking at this issue (new to this project) and I am struggling a bit.

I assume the primary changes would be made to the marshal.rs file. My first thought is that we would add more cases the loads and dumps match statements to handle PyStr, PyInt, PyFloat etc. However, the loads function expects the returning of a PyCode object, thus at some point a PyCode object would have to be created (either in loads after reading the raw bytes, or in dumps by converting all PyObjectRef into PyCode first.

Am I understanding this correctly? If so, how can we convert and the ConstantData/PyObjectRef/bytes into a PyCode or CodeObject?

FYI I am able to get any constant to a PyConstant without much trouble, it's the CodeObject creation that seems necessary and is confusing.

Thanks for any advice or tips you can give. I'm somewhat new to rust and interpreters and appreciate all the help I can get!

Your approach is correct. The return type can be changed to PyObjectRef to include any type of python object. The most common way to convert PyCode or other types into PyObjectRef is using into_pyobject. The other way - PyObjectRef to each type - will be try_into_value.