LMGTFY. https://en.wikipedia.org/wiki/Microdot

Would you provide a free mail service?

Eval is bad for security boundaries and the string based approach is a pain to develop and maintain. An alternative that is equally bad for security but better for development would be dynamic imports using importlib.

If you want to support custom scripts while enforcing security boundaries, you could use an embeddable interpreter like lua, or create your own.