@classmethod
def get(cls, **kwargs):
    """
        Generic get() for one item only

        >>> ec2.instances.get(name='production-web-01')
        <Instance: ...>
        """
    things = cls.filter(**kwargs)
    if len(things) > 1:
        raise cls.MultipleObjectsReturned
    elif len(things) == 0:
        raise cls.DoesNotExist
    return things[0]
