COBOL, Fortran and Lisp are fairly widely supported still. Getting them to mesh with Python may not be trivial, but it should be possible. I believe all of them have implementations which provide C-style foreign interfaces.

Aside from those, Pascal, APL, PL/I are still going. Algol 60 and Algol 68 were widely implemented and even have implementations today, but rarely actually used, then or now. Thinking outside the box, Forth, Smalltalk and ML are all charming in their way.

I would play to the strengths of the languages. COBOL? Formatted pretty text output. Fortran or APL? Number crunching on arrays. Lisp or ML? A parser.