Another scripting language implemented into Python itself?

[Roy Smith]

Cameron Laird <claird at lairds.us> wrote:
>It's also one that brings Tcl, mentioned several
>times in this thread, back into focus.  Tcl presents
>the notion of "safe interpreter", that is, a sub-
>ordinate virtual machine which can interpret only
>specific commands.  It's a thrillingly powerful and
>correct solution to the main problem Jeff and others
>have described.

Yup, we used that feature.  I don't remember the details, but I do
remember that you couldn't open files, and the source command only
allowed access to files in a specific directory.