def contribute_to_class(self, cls, name):
        if not self.frozen_by_south and [f.name for f in cls._meta.fields] not in name:
            super(CurrencyField, self).contribute_to_class(cls, name)
dataset/ETHPy150Open django-money/django-money/djmoney/models/fields.py/CurrencyField.contribute_to_class/swapped operands of `not in`