## Demo of simple Object Oriented programming in Python
    ## defining a class and its methods
    ## initializing an instance
    ## creating a new instance

def vacuum_oo (path):
    f = open(path)
    for line in f.readlines():
        percept = eval(line)
        action = Rule.getMatch(percept)
        print "Percept: ", percept , "and Action: " , action
    raw_input("Press any key to exit")
    f.close()

A, B, dirty, clean, suck, right, left = 'A','B','dirty','clean', \
                                        'suck', 'right','left'
class Rule:
    rules = []  # a class-level variable: list of the rules
    def __init__(self, leftHandSide, rightHandSide):
        self.lhs = leftHandSide
        self.rhs = rightHandSide
        Rule.rules.append(self)
    def getMatch(percept):
        for r in Rule.rules:
            if percept == r.lhs:
                return r.rhs
        return False
    getMatch = staticmethod(getMatch)


Rule ([A, dirty], suck)
Rule ([B, dirty], suck)
Rule ([A, clean], right)
Rule ([B, clean], left)