使用统一和正则表达式创建关系

Creating relations with unify and regular expression

我正在尝试使用 unify 创建关系,例如:

Boy(Mike) --> Mike is a boy

Girl(Lisa) --> Lisa is a girl

isSister(Mike,Lisa) --> Lisa is Mike's sister

这是我的代码:

from fact import Fact
from logic import get, unify, var

from itertools import chain 
import regex as re


facts = {}

pattern = r"(\w+)\((?:([^,\)]+)\,(?:([^,\)]+)))+\)\.?"

rule = input('Ingrese un hecho o consulta:')
while rule != '!':
  match = re.match(pattern, rule)
  print(match)
  name = match.captures(1)[0]
  argument1 = match.captures(2)
  argument2 = match.captures(3)
  if rule.endswith('.'):
    if not name in facts:
      facts[name] = Fact()
    facts[name].append(argument1[0])
    facts[name].append(argument2[0])
  else:
    X = var()
    Y = var()
    for _ in facts[name](X,Y): print(get(X),get(Y))
  rule = input('Ingrese un hecho o consulta:')

我想要的是,当我要求 isSister(?,Lisa) 时,returns Mike。 这是我得到的:

Traceback (most recent call last): File "main.py", line 17, in name = match.captures(1)[0] AttributeError: 'NoneType' object has no attribute 'captures'

match returns None 如果没有匹配项,这似乎发生在 while 循环中的某处。您需要通过以下方式以某种方式处理这种情况:

if match == None:
    # handle

或:

try:
   name=match.captures(1)[0]
except AttributeError as e:
    # handle

您可以选择适合您的解决方案的处理方式,但这是我通常选择的两种模式。我敢肯定还有其他人,但我建议从这里开始。