[Tutor] My first python gotcha

[dominic.fox]

Looked like this:

class FSM:
    """A finite state machine."""
    def __init__(self):
        self.state = ''
        self.states = {}
    def addState(self, name, rules=[]):
        self.states[name] = rules
    def addRule(self, name, rule):
        self.states[name].append(rule)
    def setState(self, state):
        self.state = state
    def receive(self, input):
        for nextRule in self.states[self.state]:
            result, toState = nextRule(input)
            if (result == 1):
                self.state = toState
                break

The assignment rules=[] in addState was what got me. Every time I added a
rule, it got added to everything...

Dom

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