Using Python As an Extensibility Library

[kmalloc]

Hi everyone! I have been using Python for some time now and am
impressed by the capabilities stored in this powerful language.

Recently I have been looking a bit into the source code of Python. I
am interested in using Python as an extensibility library for
applications I am writing, much like GNU's Guile is supposed to be.
The goal is to allow applications to run user-written Python code in
contexts they set up for it. Suppose I have an emacs-style text
editor, which will export simple APIs like the following:
OpenDocument will return an instance of a Document class which will
support methods like Save, Close, SaveAs, etc.. I want the client
Python code to be able to call all these APIs, But in order to do so I
have to declare the Document class programatically before running the
client code using the embedding API provided by Python.

I hope the text above is clear so far. Since I am just beginning
programming with the Python/C API, I have several questions:

1) I understand it is possible to run client code using an
already-set-up context containing classes, variables and functions.
How do I exactly do that?
2) I have unsuccessfully tried to programmatically create a Python
class in an existing module dictionary. All I got was an access
violation...
Can anyone explain to me how to do that "the right way"?

I'd really really appreciate any help from you guys...

Thanks in advance...

kmalloc