[英]How to get a rule activation to call a python function, using PyClips
我正在嘗試PyClips,並且希望將其與Python緊密集成,以便在激活規則時調用python函數。
這是我到目前為止的內容:
import clips
def addf(a, b):
return a + b
clips.RegisterPythonFunction(addf)
clips.Build("""
(defrule duck
(animal-is duck)
=>
(assert (sound-is quack))
(printout t "it’s a duck" crlf))
(python-call addf 40 2 )
""")
但是,當我斷言“動物是鴨子”這一事實時,我的python函數並未被調用:
>>> clips.Assert("(animal-is duck)")
<Fact 'f-0': fact object at 0x7fe4cb323720>
>>> clips.Run()
0
我究竟做錯了什么?
有一個放錯位置的括號,太早關閉了規則,而python-call
了python-call
:
clips.Build("""
(defrule duck
(animal-is duck)
=>
(assert (sound-is quack))
(printout t "it's a duck" crlf))
(python-call addf 40 2 ) ^
""") ^ |
| this one
|
should go here
如果要驗證addf
實際上返回了42,則可以將結果綁定並打印出來:
clips.Build("""
(defrule duck
(animal-is duck)
=>
(assert (sound-is quack))
(printout t \"it's a duck\" crlf)
(bind ?tot (python-call addf 40 2 ))
(printout t ?tot crlf))
""")
clips.Assert("(animal-is duck)")
clips.Run()
t = clips.StdoutStream.Read()
print t
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