fabll is a Python framework to model circuits, much like ato. It unlocks the whole Turing-complete power of Python to do design in, plus low-level procedural code and logic. Think of it like writing C for a Python module. Its focus is power—not ease of use like ato—so it’s not recommended for most designs to start with.
fabll is currently in a very early stage of development. It’s not publicly supported yet.

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Disambiguation: fabll vs ato

Think of it like the difference between C (fabll) and JavaScript (ato). fabll is for really complicated modular building block modules, while ato is better for most of the composition and simple modules.

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Building fabll code

To build a fabll module with atopile, you just need to point to the module within your ato.yaml configuration file. When you run ato build, atopile automatically builds the fabll module and links it to your project.

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Importing fabll code

You can just import fabll modules in ato like any other import: 
from "path/to/some/fabll.py" import SomeModule