Ruly is a simple, lightweight rule engine that can be used to define rules and prove statements using backward chaining. It attempts to be highly configurable, allowing callers of its functions to define callbacks in cases for conflict resolutions or derivations of new rules.
Ruly can be installed and used as a Python package. It can be installed by calling:
pip install ruly
import ruly
knowledge_base = ruly.knowledge_base.create([
"IF color = 'red' THEN creature = 'dragon'",
"IF color = 'grey' THEN creature = 'rat'"])
print(ruly.backward_chain(knowledge_base, 'creature', color='red'))
# prints dragon
For more examples and information on how to create new rules, solve conflicts, generate new rules on the fly during evaluations, etc., see the documentation.
To set up the development environment, requirements must be installed either by
calling setup.py
or by installing them manually using pip
and
requirements.txt
file. Also, ruly's build tool, doit
needs to be installed. Supported tasks can be listed by calling:
doit list