Arbitrary Properties from code

Let's say I have some models that look like:

class Emotion(models.Model):
mood = CharField(unique=True)

class Person(models.Model):
emotions = ManyToManyField(Emotion)
name = CharField()

angry = Emotion(mood='angry')
angry.save()
sad = Emotion(mood='sad')
sad.save()
bob = Person(name='Bob')
bob.emotions.add(angry)

From code I'd like to check if a person has a specific emotion, but if
that motion hasn't been defined before (IE: the specified mood does
not exist in the emotion table) I'd like to raise an exception. So
what I'm looking for is giving the above, a way to check that bob is
'angry', bob is not 'sad', and there is no such thing as 'happy'

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