Luca: YAML accounting and JSON tax forms
You can find the Luca documentation at Read The Docs:
Luca is prounounced “Lew-cha” and is named after Luca Pacioli, the Italian friend of Leonardo's who invented modern accounting.
Luca is not yet on the Python Package Index, but can be installed directly from GitHub:
git clone https://github.com/brandon-rhodes/luca.git pip install luca/