Synnefo

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class ItemNotExists(ValueError):

    def __init__(self, type, **kwargs):

        fields = " and ".join('%s=%s' % (k,v) for k,v in kwargs.iteritems())

        msg = "%(type)s with %(fields)s does not exist."

        super(ItemNotExists, self).__init__(msg % locals())

class ItemExists(ValueError):

    def __init__(self, type, **kwargs):

        fields = " and ".join('%s=%s' % (k,v) for k,v in kwargs.iteritems())

        msg = "%(type)s with %(fields)s already exists."

        super(ItemExists, self).__init__(msg % locals())

class MultipleItemsExist(ValueError):

    def __init__(self, type, **kwargs):

        fields = " and ".join('%s=%s' % (k,v) for k,v in kwargs.iteritems())

        msg = "There are mulptiple %(type)s with %(fields)s."

        super(MultipleItemsExist, self).__init__(msg % locals())

class MissingIdentifier(IOError):

    pass