Is there a tool to automatically create an interface using swig?

Question

I have a project running in C ++. I want to create a python shell for classes and some global functions.

I am wondering if there is any tool to create an interface file for swig automatically?

Secondly, it is very easy to write an interface file for functions. But for classes, are there any design patterns that need to be followed to cleanly create an interface?

thanks a lot