def assertNotIn(self, member, container, msg=None):
        if member in container:
            standardMsg = '%s unexpectedly found in %s' % (safe_repr(member),
                                                            safe_repr(container))
            self.fail(self._formatMessage(msg, standardMsg))
Extract the property value from the instance for use in a form.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.3/django/utils/unittest/case.py/TestCase.assertNotIn--crossover with--dataset/ETHPy150Open IanLewis/kay/kay/utils/forms/modelform.py/ReferenceProperty.get_value_for_form