“tydy” is a functional programming language implementation as a Python library
github.comMore developed alternatives:
I find Mochi to be an interesting language but unfortunately it appears to be abandonware. https://github.com/i2y/mochi/pulse/monthly
Last month activity often doesn't indicate the bitrot-ness of a project. "Graphs" paints a better image of its health. In this case, it does show the project is abandoned. Regardless, I think coconut is the more developed project out of the two.
But they are not implemented as just a library.