class DecimalObjectValue(ObjectValue):
    format = '%0.02f'

    def __init__(self, *args, **kwargs):
        super(DecimalObjectValue, self).__init__(*args,**kwargs)

    def get_object_value(self, *args, **kwargs):
        value = super(DecimalObjectValue, self).get_object_value(*args,**kwargs)

        if not value:
            value = 0

        return self.format%value