Another scripting language implemented into Python itself?

[Quest Master]

I am interested in developing an application where the user has an
ample amount of power to customize the application to their needs, and
I feel this would best be accomplished if a scripting language was
available. However, I want to code this application in Python, and I
have not yet heard of an implementation of another scripting language
into Python.

An example of what I mean is this (an implementation of Lua into Ruby
-- which I'd prefer not to use): http://ruby-lua.unolotiene.com/

I know C/C++ might be better suited for a task of this kind, but most
of the modules in my application which need speed have already been
coded in C++. I want to use Python as the "glue" for this project;
writing an entire application with a pretty GUI is not fun, as most of
you may know from previous experience.

So, my question is simply this: is there an implementation of another
scripting language into Python?