Experta is a Python library for building expert systems strongly inspired by CLIPS.
from random import choice
from experta import *
class Light(Fact):
"""Info about the traffic light."""
pass
class RobotCrossStreet(KnowledgeEngine):
@Rule(Light(color='green'))
def green_light(self):
print("Walk")
@Rule(Light(color='red'))
def red_light(self):
print("Don't walk")
@Rule(AS.light << Light(color=L('yellow') | L('blinking-yellow')))
def cautious(self, light):
print("Be cautious because light is", light["color"])
from experta import *
class Light(Fact):
"""Info about the traffic light."""
pass
class RobotCrossStreet(KnowledgeEngine):
@Rule(Light(color='green'))
def green_light(self):
print("Walk")
@Rule(Light(color='red'))
def red_light(self):
print("Don't walk")
@Rule(AS.light << Light(color=L('yellow') | L('blinking-yellow')))
def cautious(self, light):
print("Be cautious because light is", light["color"])
>> engine.run()
Be cautious because light is blinking-yellow">>>> engine = RobotCrossStreet()
>>> engine.reset()
>>> engine.declare(Light(color=choice(['green', 'yellow', 'blinking-yellow', 'red'])))
>>> engine.run()
Be cautious because light is blinking-yellow
>>> engine.reset()
>>> engine.declare(Light(color=choice(['green', 'yellow', 'blinking-yellow', 'red'])))
>>> engine.run()
Be cautious because light is blinking-yellow
Migrating from Pyknow
Experta is a Pyknow fork. Just replace any pyknow references in your code/examples to experta and everything should work the same.
Examples
You can find some more examples on GitHub.