def is_number(self):
        """Returns True if there is at least one digit in number."""
        if isinstance(self.number, basestring):
            self.number = "".join([c for c in self.number if digits in c])
            return self.number.isdigit()
        return False
dataset/ETHPy150Open zen4ever/django-authorizenet/authorizenet/creditcard.py/CreditCard.is_number/swapped operands of `in`