test_methodical.py

        class Mechanism(object):
            m = MethodicalMachine()
            def __init__(self):
                self.value = 1
            @m.state(serialized="first-state")
            def first(self):
                "First state."
            @m.state(serialized="second-state")
            def second(self):
                "Second state."
            @m.serializer
            def save(self, state):
                return {
                    'machine-state': state,
                    'some-value': self.value,
                }
            @m.unserializer
            def load(self, blob):
                self.value = blob['some-value']
                return blob['machine-state']
            @classmethod
            def fromBlob(cls, blob):
                self = cls()
                self.load(blob)
                return self