Have you looked at Lua? It's pretty similar to Python (with a bit more Scheme influence), but is very deliberately designed for embedding. Also, all state is co

Have you looked at Lua? It's pretty similar to Python (with a bit more Scheme influence), but is very deliberately designed for embedding. Also, all state is contained in the Lua_state pointer, so you can concurrently run several Lua VMs when it suits you to. You don't need to wait years for Python to work its concurrency issues out.